publicationDate stringlengths 1 2.79k | title stringlengths 1 36.5k ⌀ | abstract stringlengths 1 37.3k ⌀ | id stringlengths 9 47 |
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2006-02-24 | Quantum Criticality in doped CePd_1-xRh_x Ferromagnet | CePd_1-xRh_x alloys exhibit a continuous evolution from ferromagnetism (T_C=
6.5 K) at x = 0 to a mixed valence (MV) state at x = 1. We have performed a
detailed investigation on the suppression of the ferromagnetic (F) phase in
this alloy using dc-(\chi_dc) and ac-susceptibility (\chi_ac), specific heat
(C_m), resisti... | 0602588v1 |
2006-07-20 | Strained Si, Ge and SiGe alloys modeling with full-zone k.p method optimized from first principle calculation | The electronic energy band structure of strained and unstrained Si, Ge and
SiGe alloys is examined in this work using thirty-level k.p analysis. The
energy bands are at first obtained with ab initio calculations based on the
Local-Density-Approximation of Density-Functional Theory, including a GW
correction and relativ... | 0607510v2 |
2006-08-21 | Scaling Behaviour and Complexity of the Portevin-Le Chatelier Effect | The plastic deformation of dilute alloys is often accompanied by plastic
instabilities due to dynamic strain aging and dislocation interaction. The
repeated breakaway of dislocations from and their recapture by solute atoms
leads to stress serrations and localized strain in the strain controlled
tensile tests, known as... | 0608434v1 |
2006-10-07 | Synthesis of nanocrystalline (Co,Ni)Al2O4 spinel powder by mechanical milling of quasicrystalline material | The (Co,Ni)Al2O4 is an aluminum transition metals oxide which falls into the
category of aluminate spinels. The synthesis of nano-crystalline spinels has
been investigated extensively due to their potential applications such as a
high-density magnetic recording, microwave devices magnetic fluids, ceramic
pigment as wel... | 0610203v1 |
2007-02-28 | Thermo-Mechanical Wave Propagation In Shape Memory Alloy Rod With Phase Transformations | Many new applications of ferroelastic materials require a better
understanding of their dynamics that often involve phase transformations. In
such cases, an important prerequisite is the understanding of wave propagation
caused by pulse-like loadings. In the present study, a mathematical model is
developed to analyze t... | 0702689v1 |
2007-02-28 | On High Explosive Launching of Projectiles for Shock Physics Experiments | The hydrodynamic operation of the `Forest Flyer' type of explosive launching
system for shock physics projectiles was investigated in detail using one- and
two-dimensional continuum dynamics simulations. The simulations were
insensitive to uncertainties in the material properties, and reproduced
measurements of the pro... | 0702693v1 |
2007-03-19 | Size effects in the magnetic behaviour of TbAl_2 milled alloys | The study of the magnetic properties depending upon mechanical milling of the
ferromagnetic polycrystalline TbAl_2 material is reported. The Rietveld
analysis of the X-ray diffraction data reveals a decrease of the grain size
down to 14 nm and -0.15 % of variation of the lattice parameter, after 300
hours of milling ti... | 0703489v1 |
1996-02-07 | The Structure, Dynamics and Electronic Structure of Liquid Ag-Se Alloys Investigated by Ab Initio Simulation | Ab initio molecular-dynamics simulations have been used to investigate the
structure, dynamics and electronic properties of the liquid alloy Ag(1-x)Se(x)
at 1350 K and at the three compositions x=0.33, 0.42 and 0.65. The calculations
are based on density-functional theory in the local density approximation and
on the p... | 9602001v1 |
1999-05-28 | Electron Spin Resonance Transistors for Quantum Computing in Silicon-Germanium Heterostructures | We apply the full power of modern electronic band structure engineering and
epitaxial heterostructures to design a transistor that can sense and control a
single donor electron spin. Spin resonance transistors may form the
technological basis for quantum information processing. One and two qubit
operations are performe... | 9905096v2 |
2007-09-20 | A fast simulator for polycrystalline processes with application to phase change alloys | We present a stochastic simulator for polycrystalline phase-change materials
capable of spatio-temporal modelling of complex anneals. This is based on
consideration of bulk and surface energies to generate rates of growth and
decay of crystallites built up of `monomers' that themselves may be quite
complex molecules. W... | 0709.3183v2 |
2008-02-13 | Magnetoresistance behavior of a ferromagnetic shape memory alloy: Ni_1.75Mn_1.25Ga | A negative-positive-negative switching behavior of magnetoresistance (MR)
with temperature is observed in a ferromagnetic shape memory alloy
Ni_1.75Mn_1.25Ga. In the austenitic phase between 300 and 120 K, MR is negative
due to s-d scattering. Curiously, below 120K MR is positive, while at still
lower temperatures in t... | 0802.1801v2 |
2008-05-15 | Evidence of valence band perturbations in GaAsN/GaAs(001): A combined variable-angle spectroscopic ellipsometry and modulated photoreflectance investigation | The contribution of the fundamental gap E_ as well as those of the E_ +
Delta(so) and E+ transitions to the dielectric function of GaAs1-xNx alloys
near the band edge were determined from variable-angle spectroscopic
ellipsometry and modulated photoreflectance spectroscopy analyses. The
oscillator strength of the E_ op... | 0805.2212v1 |
2008-06-14 | Synthesis of nanocrystalline Spinel phase by Mechanical Milling of Al-Cu-Fe and Al-Cu-Cr-Fe Quasicrystalline alloys | In the present study, low-temperature synthesis of (Cu Fe)Al2O4 and (Cu Cr
Fe)Al2O4 spinels from the quasicrystalline phases was investigated with the
variation of process parameters during milling and annealing. The milling of
the quasicrystalline materials was carried out in an attritor mill at 400 rpm
for 40 hours w... | 0806.2381v1 |
2009-01-05 | Transport and magnetotransport properties of cold-pressed CrO$_2$ powder, prepared by hydrothermal synthesis | Submicron powder of CrO$_2$ was prepared by hydrothermal synthesis method
from chromium trioxide. Particles obtained were of rounded form with mean
diameter about 120 nm. The powder (stabilized with thin surface layer of
\beta-CrOOH) has been characterized by structural, X-ray and magnetic
measurements. The powder (wit... | 0901.0491v1 |
2009-01-11 | Optical vibrations of hydrogen in disordered palladium-gold alloys | In the fcc lattice of Pd, hydrogen occupies octahedral interstitial positions
with cubic symmetry. One could therefore expect that in dilute solid H
solutions in Pd the fundamental band of optical H vibrations should be reduced
to a narrow line of 3-fold degenerate, non-interacting isotropic local
oscillators. A few at... | 0901.1381v1 |
2009-01-29 | Alloying effects on the optical properties of Ge$_{1-x}$Si$_x$ nanocrystals from TDDFT and comparison with effective-medium theory | We present the optical spectra of Ge$_{1-x}$Si$_x$ alloy nanocrystals
calculated with time-dependent density-functional theory in the adiabatic
local-density ap proximation (TDLDA). The spectra change smoothly as a function
of the compositio n $x$. On the Ge side of the composition range, the lowest
excitations at the ... | 0901.4706v1 |
2009-07-10 | Energy effects on alloying through a re-interpretation of the parameters of Miedema | The parameters Phi and N of Miedema are quoted precise to the second decimal
place and are considered very accurate after adjustment in their values to
correctly predict the signs of the heats of formation of more than 500 metallic
binary systems. In this paper, we argue that Phi is proportional to the
electronegativit... | 0907.1799v1 |
2010-02-05 | Establishment of Relationships between Material Design and Product Design Domains by Hybrid FEM-ANN Technique | In this paper, research on AI based modeling technique to optimize
development of new alloys with necessitated improvements in properties and
chemical mixture over existing alloys as per functional requirements of product
is done. The current research work novels AI in lieu of predictions to
establish association betwe... | 1002.1157v1 |
2010-02-08 | Amplitude equations for polycrystalline materials with interaction between composition and stress | We investigate the ability of frame-invariant amplitude equations [G. H.
Gunaratne, Q. Ouyang, and H. Swinney, Phys. Rev. E {\bf 50}, 2802 (1994)] to
describe quantitatively the evolution of polycrystalline microstructures and we
extend this approach to include the interaction between composition and stress.
Validation... | 1002.1580v1 |
2010-06-04 | Electronic structure and the glass transition in pnictide and chalcogenide semiconductor alloys. Part I: The formation of the $ppσ$-network | Semiconductor glasses exhibit many unique optical and electronic anomalies.
We have put forth a semi-phenomenological scenario (J. Chem. Phys. 132, 044508
(2010)) in which several of these anomalies arise from deep midgap electronic
states residing on high-strain regions intrinsic to the activated transport
above the g... | 1006.0771v2 |
2010-09-02 | Short-range order and precipitation in Fe-rich Fe-Cr alloys: Atomistic off-lattice Monte Carlo simulations | Short-range order (SRO) in Fe-rich Fe-Cr alloys is investigated by means of
atomistic off-lattice Monte Carlo simulations in the semi-grand canonical
ensemble using classical interatomic potentials. The SRO parameter defined by
Cowley [Phys. Rev. B 77, 669 (1950)] is used to quantify the degree of
ordering. In agreemen... | 1009.0511v1 |
2010-09-05 | Search and identification of repeated magnetic compensation in Nd(1-x)R(x)Al(2) (R = Gd, Tb) series | We undertook investigations in polycrystalline R(x)R'(1-x)Al(2) alloys, in
particular, explored the stoichiometries, Nd(0.8)Gd(0.2)Al(2) and
Nd(0.8)Tb(0.2)Al(2), to study the magnetic compensation behavior in them in the
context of contemporary interest. In these admixed rare-earth (RE)
intermetallics, the compensation... | 1009.0927v1 |
2010-10-19 | Magnetic properties of $σ$-FeCr alloy as calculated with the charge and spin self-consistent KKR(CPA) method | Magnetic properties of a $\sigma-$Fe$_{16}$Cr$_{14}$ alloy calculated with
the charge and spin self- consistent Korringa-Kohn-Rostoker (KKR) and combined
with coherent potential approximation (KKR-CPA) methods are reported.
Non-magnetic state as well as various magnetic orderings were considered, i.e.
ferromagnetic (FM... | 1010.3856v1 |
2011-02-24 | Polarization-balanced design of AlN/GaN heterostructures: Application to double-barrier structures | Inversion- and depletion-regions generally form at the interfaces between
doped leads (cladding layers) and the active region of polar heterostructures
like AlN/GaN and other nitride compounds. The band bending in the depletion
region sets up a barrier which may seriously impede perpendicular electronic
transport. This... | 1102.4977v2 |
2011-04-26 | Dealloying of Platinum-Aluminum Thin Films Part I. Dynamics of Pattern Formation | Applying focused ion beam (FIB) nanotomography and Rutherford backscattering
spectroscopy (RBS) to dealloyed platinum-aluminum thin films an in-depth
analysis of the dominating physical mechanisms of porosity formation during the
dealloying process is performed. The dynamical porosity formation due to the
dissolution o... | 1104.4944v1 |
2011-06-23 | Experimental evidence of Alfvén wave propagation in a Gallium alloy | Experiments with a liquid metal alloy, galinstan, are reported and show clear
evidence of Alfv\'en wave propagation as well as resonance of Alfv\'en modes.
Galinstan is liquid at room temperature, and although its electrical
conductivity is not as large as that of liquid sodium or NaK, it has still been
possible to stu... | 1106.4727v2 |
2011-07-12 | Amplification of spin-filtering effect by magnetic field in GaAsN alloys | We have found that intensity $I$ and circular polarization degree $\rho$ of
the edge photoluminescence, excited in GaAsN alloys by circularly polarized
light at room temperature, grow substantially in the longitudinal magnetic
field $B$ of the order of 1\,kG. This increase depends on the intensity of
pumping and, in th... | 1107.2250v1 |
2011-07-22 | Structure of long-period stacking/order Mg-Zn-RE (RE: rare-earth and Y) phases with extended non-stoichiometry ranges | We propose structure models of the unique long-period stacking/order (LPSO)
phases formed in the Mg-Zn-RE alloys, based on Z-contrast scanning transmission
electron microscopy (STEM) observations and first-principles calculations. The
LPSO structures are long-period stacking derivatives of the hcp-Mg structure,
and the... | 1107.4602v2 |
2011-09-02 | History dependent nucleation and growth of the martensitic phase in a magnetic shape memory alloy Ni$_{45}$Co$_{5}$Mn$_{38}$Sn$_{12}$ | We study through the time evolution of magnetization the low temperature (T)
dynamics of the metastable coexisting phases created by traversing different
paths in magnetic field (H) and T space in a shape memory alloy system,
Ni$_{45}$Co$_{5}$Mn$_{38}$Sn$_{12}$. It is shown that these coexisting phases
consisting of a ... | 1109.0405v2 |
2011-09-19 | Electronic structure and self energies of randomly substituted solids using density functional theory and model calculations | We describe procedures to obtain the electronic structure of disordered
systems using either tight binding like models or quite directly from ab inito
density functional band structure calculations. The band structure is
calculated using super cells much larger than those containing a single
minority component atom. We... | 1109.4036v1 |
2011-09-29 | Re-examination of the SiGe Raman spectra - Linear chain approximation and ab initio calculations | We propose a (three-dimension) -> (one-dimension) shift of paradigm for basic
understanding of Raman spectra of random Si-Ge. Fair contour modeling of Raman
spectra is achieved along the linear chain approximation via 1D-cluster version
of the phenomenological Percolation scheme, originally developed for zincblende
all... | 1109.6585v2 |
2011-11-07 | Quadrupolar spectra of nuclear spins in strained InGaAs quantum dots | Self-assembled quantum dots (QDs) are born out of lattice mismatched
ingredients where strain plays an indispensable role. Through the electric
quadrupolar coupling, strain affects the magnetic environment as seen by the
nuclear spins. To guide prospective single-QD nuclear magnetic resonance (NMR)
as well as dynamic n... | 1111.1499v2 |
2011-12-22 | Theory of band gap bowing of disordered substitutional II-VI and III-V semiconductor alloys | For a wide class of technologically relevant compound III-V and II-VI
semiconductor materials AC and BC mixed crystals (alloys) of the type
A(x)B(1-x)C can be realized. As the electronic properties like the bulk band
gap vary continuously with x, any band gap in between that of the pure AC and
BC systems can be obtaine... | 1112.5372v2 |
2012-02-09 | Magnetic properties and critical behavior of disordered Fe_{1-x}Ru_x alloys: a Monte Carlo approach | We study the critical behavior of a quenched random-exchange Ising model with
competing interactions on a bcc lattice. This model was introduced in the study
of the magnetic behavior of Fe_{1-x}Ru_x alloys for ruthenium concentrations
x=0%, x=4%, x=6%, and x=8%. Our study is carried out within a Monte Carlo
approach, w... | 1202.2104v1 |
2012-03-22 | Crystal Chemistry and Magnetic Properties of Manganese Zinc Alloy "YMn2Zn20" Comprising a Mn Pyrochlore Lattice | The chemical composition, crystal structure, and magnetic properties of a
manganese zinc alloy with an ideal composition of YMn2Zn20, which comprises a
pyrochlore lattice made of Mn atoms, are reported. The compound is stable only
when In or Al is partially substituted for Zn. We have determined the actual
chemical for... | 1203.4887v1 |
2012-04-18 | Controlling bulk conductivity in topological insulators: Key role of anti-site defects | The binary Bi-chalchogenides, Bi2Ch3, are widely regarded as model examples
of a recently discovered new form of quantum matter, the three-dimensional
topological insulator (TI) [1-4]. These compounds host a single spin-helical
surface state which is guaranteed to be metallic due to time reversal symmetry,
and should b... | 1204.4063v1 |
2012-05-24 | Enhancing magnetocrystalline anisotropy of the Fe70Pd30 magnetic shape memory alloy by adding Cu | Strained epitaxial growth provides the opportunity to understand the
dependence of intrinsic and extrinsic properties of functional materials at
frozen intermediate stages of a phase transformation. In this study, a
combination of thin film experiments and first-principles calculations yields
the binding energy and mag... | 1205.5422v1 |
2012-07-15 | Synthesis and Characterization of TiFe0.7-xMn0.3Vx (x=0.05, and 0.1) and Ti1-yTayFe0.7Mn0.3 (y=0.2, and 0.4) Nanostructured Metal Hydrides for Low Temperature Applications | Metal hydrides (MH) are often preferred to absorb and desorb hydrogen at
ambient temperature and pressure with a high volumetric density. These hydrogen
storage alloys create promising prospects for hydrogen storage and can solve
the energetic and environmental issues. In the present research work, the goal
of our stud... | 1207.3503v1 |
2012-08-28 | With no Color and Scent (part III): Architecture of metal shells grown on templates by pulse current electrodeposition | A method of growing mushroom or shell like nanostructured metal convex
concave models has been worked out. Silver,copper,nickel,rhodium and
Pd-Ni,Pd-Co alloy structures are reproduced as a result of self-assembly of
nanowires growing on porous membranes in the course of pulse current
electrodeposition. It is shown that... | 1208.5546v1 |
2012-10-11 | Growth of carbon nanotubes on quasicrystalline alloys | We report on the synthesis of carbon nanotubes on quasicrystalline alloys.
Aligned multiwalled carbon nanotubes (MWNTs) on the conducting faces of
decagonal quasicrystals were synthesized using floating catalyst chemical vapor
deposition. The alignment of the nanotubes was found perpendicular to the
decagonal faces of ... | 1210.3108v1 |
2012-10-26 | Enhancement of superconductivity by external magnetic field in magnetic alloys | An asymptotic solution of the thermodynamics of a BCS superconductor
containing spin 1/2 and 7/2 magnetic impurities, obtained recently in Ref. 1 is
exploited to derive the expressions for critical magnetic field
$H_{\mathrm{c}}(T)$ . The credibility of the resulting theoretical equations,
which depend on the magnetic ... | 1210.7104v1 |
2013-01-18 | Engineering quantum anomalous Hall phases with orbital and spin degrees of freedom | Combining tight-binding models and first principles calculations, we
investigate the quantum anomalous Hall (QAH) effect induced by intrinsic
spin-orbit coupling (SOC) in buckled honeycomb lattice with sp orbitals in an
external exchange field. Detailed analysis reveals that nontrivial topological
properties can arise ... | 1301.4426v1 |
2013-02-08 | In situ visualization of Ni-Nb bulk metallic glasses phase transition | We report the results of the Ni-based bulk metallic glass structural
evolution and crystallization behavior in situ investigation. The X-ray
diffraction (XRD), transmission electron microscopy (TEM), nano-beam
diffraction (NBD), differential scanning calorimetry (DSC), radial distribution
function (RDF) and scanning pr... | 1302.1982v2 |
2013-02-14 | Evidence for length-dependent wire expansion, filament dedensification and consequent degradation of critical current density in Ag-alloy sheathed Bi-2212 wires | It is well known that longer Bi-2212 conductors have significantly lower
critical current density (Jc) than shorter ones, and recently it has become
clear that a major cause of this reduction is internal gas pressure generated
during heat treatment, which expands the wire diameter and dedensifies the
Bi-2212 filaments.... | 1302.3370v1 |
2013-03-12 | Démixtion et ségrégation superficielle dans les alliages fer-chrome | Ferritic steels possibly strengthened by oxide dispersion are candidates as
structural materials for generation IV and fusion nuclear reactors. Their use
is limited by incomplete knowledge of the iron-chromium phase diagram at low
temperatures and of the phenomena inducing preferential segregation of one
element at gra... | 1303.2938v1 |
2013-03-20 | Performance of Titanium-Oxide/Polymer Insulation in Bi-2212/Ag-alloy Round Wire Wound Superconducting Coils | Conductor insulation is one of the key components needed to make Ag-alloy
clad Bi2Sr2CaCu2O8+x (Bi-2212/Ag) superconducting round wire (RW) successful
for high field magnet applications as dielectric standoff and high winding
current densities (Jw) directly depend on it. In this study, a TiO2/polymer
insulation coating... | 1303.4810v1 |
2013-03-20 | Genetic Design of Enhanced Valley Splitting towards a Spin Qubit in Silicon | Electronic spins in Silicon (Si) are rising contenders for qubits -- the
logical unit of quantum computation-- owing to its outstanding spin coherence
properties and compatibility to standard electronics. A remarkable limitation
for spin quantum computing in Si hosts is the orbital degeneracy of this
material's conduct... | 1303.4932v1 |
2013-04-30 | SiGe Raman spectra vs. local clustering/anticlustering : Percolation scheme and ab initio calculations | We formalize within the percolation scheme, that operates along the linear
chain approximation, namely at one dimension (1D), an intrinsic ability behind
Raman scattering to achieve a quantitative insight into local clustering or
anticlustering in an alloy, using SiGe as a case study. For doing so, we derive
general ex... | 1304.7970v1 |
2013-05-22 | Interface kinetics in phase field models: isothermal transformations in binary alloys and steps dynamics in molecular-beam-epitaxy | We present a unified description of interface kinetic effects in phase field
models for isothermal transformations in binary alloys and steps dynamics in
molecular-beam-epitaxy. The phase field equations of motion incorporate a
kinetic cross-coupling between the phase field and the concentration field.
This cross coupl... | 1305.5052v2 |
2013-07-08 | 5d transition metal oxide IrO2 as a material for spin current detection | Devices based on a pure spin current (a flow of spin angular momentum) have
been attracting increasing attention as key ingredients for low-dissipation
electronics. To integrate such spintronics devices into charge-based
technologies, an electric detection of spin current is essential. Inverse spin
Hall effect converts... | 1307.2121v1 |
2013-07-11 | On chemical order and interfacial segregation in $γ^\prime$ (AlAg$_2$) precipitates | A detailed study has been carried out on $\gamma^\prime$ (AlAg$_2$)
precipitates in Al-Ag and Al-Ag-Cu alloys to reconcile the conflicting reports
on chemical ordering and stacking faults in this phase. High angle annular dark
field scanning transmission electron microscopy and convergent beam electron
diffraction show... | 1307.2996v3 |
2013-07-16 | Influence of the Core/Shell Interface on Biexciton Auger Recombination in Individual Nanocrystal Quantum Dots | Previous single-particle spectroscopic studies of colloidal quantum dots have
indicated a significant spread in biexciton lifetimes across an ensemble of
nominally identical nanocrystals. It has been speculated that in addition to
dot-to-dot variation in physical dimensions, this spread is contributed to by
variations ... | 1307.4433v3 |
2013-08-18 | Simulation of the nanostructure evolution under irradiation in Fe-C alloys | Neutron irradiation induces in steels nanostructural changes, which are at
the origin of the mechanical degradation that these materials experience during
operation in nuclear power plants. Some of these effects can be studied by
using as model alloy the iron-carbon system.
The Object Kinetic Monte Carlo technique ha... | 1308.3866v1 |
2013-09-27 | Preparation and tunable mid-IR optical properties of ternary Cd_{1-x}Pb_xS nanocrystals by mechanical alloying | Composition-tunable ternary Cd1-xPbxS nanocrystals (NCs) are very important
materials for remote sensing and detecting in the infrared (IR) wavelength
region. They are, however, almost exclusively prepared by wet chemical routes
which leads to surface-capped nanoparticles. The surface capping molecules
could move their... | 1309.7148v2 |
2013-10-23 | Magnetic properties and electronic structure of Mn-Ni-Ga magnetic shape memory alloys | Influence of disorder, antisite defects, martensite transition and
compositional variation on the magnetic properties and electronic structure of
Mn$_2$NiGa and Mn$_{1+x}$Ni$_{2-x}$Ga magnetic shape memory alloys have been
studied by using full potential spin-polarized scalar relativistic
Korringa-Kohn-Rostocker (FP-SP... | 1310.6130v2 |
2013-11-25 | Structural and Dielectric Characterization on Multiferroic xNi0.9Zn0.1Fe2O4/(1-x)PbZr0.52Ti0.48O3 Particulate Composite | We have carried out the powder x-ray diffraction and dielectric studies on
multiferroic particulate composite xNi0.9Zn0.1Fe2O4/(1-x)PbZr0.52Ti0.48O3 with
x=0.15, 0.30, 0.45, 0.60, 0.75 and 0.90 to explore the structural and
ferroelectric properties. A conventional double sintering method was used to
prepare the xNi0.9Z... | 1311.6217v2 |
2013-12-11 | Structural and electronic properties of the mu-phase Fe-Mo compounds | Structural (lattice parameters and sublattice occupancies) and electronic
(charge-density and electric field gradient) properties in a series of
compounds mu-Fe_(100-x)Mo_x were studied experimentally (X-ray diffraction and
Mossbauer spectroscopy) and theoretically (charge and spin self-consistent
KorringaKohnRostoker ... | 1312.3130v2 |
2014-03-07 | Analysis of Femoral Components of Cemented Total Hip- Arthroplasty | In cemented Total Hip Arthroplasty (THA), material chosen for femoral stem
and cross section of stem itself, proved to be critical parameters for, stress
distribution in the femoral components, interfacial stresses and micro
movements. Titanium alloy (Ti6Al4V), when used as a material for femoral stem,
recorded large d... | 1403.1867v1 |
2014-03-22 | Effect of Aspect Ratio and Boundary Conditions in Modeling Shape Memory Alloy Nanostructures with 3D Coupled Dynamic Phase-Field Models | The behavior of shape memory alloy (SMA) nanostructures is influenced by
strain rate and temperature evolution during dynamic loading. The coupling
between temperature, strain and strain rate effects is essential to capture
inherent thermo-mechanical behavior in SMAs. In this paper, we propose a new
fully coupled therm... | 1403.5608v2 |
2014-07-11 | Effects of dilute substitutional solutes on carbon in $α$-Fe: interactions and associated carbon diffusion from first-principles calculations | By means of first-principles calculations coupled with the kinetic Monte
Carlo simulations, we have systematically investigated the effects of dilute
substitutional solutes on the behaviors of carbon in $\alpha$-Fe. Our results
uncover that: ($i$) Without the Fe vacancy the interactions between most
solutes and carbon ... | 1407.2993v1 |
2014-07-14 | An Alloy Verification Model for Consensus-Based Auction Protocols | Max Consensus-based Auction (MCA) protocols are an elegant approach to
establish conflict-free distributed allocations in a wide range of network
utility maximization problems. A set of agents independently bid on a set of
items, and exchange their bids with their first hop-neighbors for a distributed
(max-consensus) w... | 1407.5074v2 |
2014-07-27 | The nanostructure evolution in Fe-C systems under irradiation at 560 K | This work extends our Object Kinetic Monte Carlo model for neutron
irradiation-induced nanostructure evolution in Fe-C alloys to consider higher
irradiation temperatures. The previous study concentrated on irradiation
temperatures < 370 K. Here we study the evolution of vacancy and
self-interstitial atom (SIA) cluster ... | 1407.7215v1 |
2014-07-30 | Electronic structure, metamagnetism and thermopower of LaSiFe$_{12}$ and interstitially doped LaSiFe$_{12}$ | We present a systematic investigation of the effect of H, B, C, and N
interstitials on the electronic, lattice and magnetic properties of
La(Fe,Si)$_{13}$ using density functional theory. The parent LaSiFe$_{12}$
alloy has a shallow, double-well free energy function that is the basis of
itinerant metamagnetism. On incr... | 1407.7975v2 |
2014-08-02 | Nuclear magnetic resonance inverse spectra of InGaAs quantum dots: Atomistic level structural information | A wealth of atomistic information is contained within a self-assembled
quantum dot (QD), associated with its chemical composition and the growth
history. In the presence of quadrupolar nuclei, as in InGaAs QDs, much of this
is inherited to nuclear spins via the coupling between the strain within the
polar lattice and t... | 1408.0373v2 |
2014-09-03 | Nanoscale confinement of all-optical switching in TbFeCo using plasmonic antennas | All-optical switching (AOS) of magnetic domains by femtosecond laser pulses
was first observed in the transition metal-rare earth (TM-RE) alloy GdFeCo1-5;
this phenomenon demonstrated the potential for optical control of magnetism for
the development of ever faster future magnetic recording technologies. The
technologi... | 1409.1280v1 |
2014-09-05 | Monoclinic (Mc) phase and electric field induced phase transformation in BaTiO3 | For decades it has been a well-known fact that among the few ferroelectric
compounds in the perovskite family namely BaTiO3, KNbO3, PbTiO3 Na1/2Bi1/2TiO3
the dielectric and piezoelectric properties of BaTiO3 is considerably higher
than the others in polycrystalline form at room temperature. Further, similar
to ferroele... | 1409.1692v1 |
2014-09-30 | Investigation of the anisotropic electron g factor as a probe of the electronic structure of GaBi$_{x}$As$_{1-x}$/GaAs epilayers | The electron Land\'e g factor ($g^{*}$) is investigated both experimentally
and theoretically in a series of GaBi$_{x}$As$_{1-x}$/GaAs strained epitaxial
layers, for bismuth compositions up to $x = 3.8$%. We measure $g^{*}$ via
time-resolved photoluminescence spectroscopy, which we use to analyze the spin
quantum beats... | 1409.8467v1 |
2014-10-02 | Electronic correlations in Fe at Earth's inner core conditions: effect of doping with Ni | We have studied the body-centered cubic (bcc), face-centered cubic (fcc) and
hexagonal close-packed (hcp) phases of Fe alloyed with 25 at. % of Ni at
Earth's core conditions using an ab initio local density approximation +
dynamical mean-field theory (LDA+DMFT) approach. The alloys have been modeled
by ordered crystal ... | 1410.0596v1 |
2014-11-03 | Synthesis from Formal Partial Abstractions | Developing complex software systems is costly, time-consuming and
error-prone. Model- driven development (MDD) promises to improve software
productivity, timeliness, quality and cost through the transformation of
abstract application models to code-level implementations. However, it remains
unreasonably difficult to bu... | 1411.0481v1 |
2014-11-06 | Thermally induced changes of structure in Ni$_{50}$Mn$_{25+x}$Ga$_{25-x}$ magnetic shape memory single crystals with very low twinning stress | In search for the origins of the extraordinary low twinning stress of
Ni-Mn-Ga magnetic shape memory alloys we studied the thermally induced changes
of structure in Ni$_{50}$Mn$_{25+x}$Ga$_{25-x}$ ($x$=2.7--3.9) single crystal
samples and compared them with twinning stress dependences. The alloys
exhibited transformati... | 1411.1550v1 |
2014-11-19 | Internally Oxidized Nb3Sn Strands with Fine Grain Size and High Critical Current Density | Nb3Sn superconducting strands are the most practical conductors to generate
high magnetic fields (12-16 T), and thus have significant applications in
nuclear magnetic resonance (NMR), and great potential for fusion reactors and
particle accelerator magnets. High critical current density (Jc) is a key
parameter for such... | 1411.5397v1 |
2014-12-11 | Characterization of precipitation in Al-Li alloy AA2195 by means of atom probe tomography and transmission electron microscopy | The microstructure of the commercial alloy AA2195 was investigated on the
nano-scale after conducting a T8 tempering. This particular thermo-mechanical
treatment of the specimen resulted in the formation of platelet-shaped $T_{1}$
($Al_{2}CuLi$)/ $\theta^{'}$($Al_{2}Cu$) within the Al-matrix. The
electrochemically prep... | 1412.3727v1 |
2014-12-24 | Probing the magnetic phases in the Ni-V alloy close to the disordered ferromagnetic quantum critical point with muSR | Zero (ZF) and longitudinal field (LF) muon spin relaxation data of the {\it
d}-metal alloy Ni$_{1-x}$V$_{x}$ are presented at several vanadium
concentrations $x$ below and above the critical $x_c \approx 11$% where
long-range ferromagnetic (FM) order is suppressed. The clear single precession
frequency observed for Ni,... | 1412.7671v1 |
2015-01-30 | Unconventional phase selection in high-driven systems: A complex metastable structure prevails over simple stable phases | Phase selection in deeply undercooled liquids and devitrified glasses during
heating involves complex interplay between the barriers to nucleation and the
ability for these nuclei to grow. During the devitrification of glassy alloys,
complicated metastable structures often precipitate instead of simpler, more
stable co... | 1502.00023v1 |
2015-04-30 | Visualization of steps and surface reconstructions in Helium Ion Microscopy with atomic precision | Helium Ion Microscopy is known for its surface sensitivity and high lateral
resolution. Here, we present results of a Helium Ion Microscopy based
investigation of a surface confined alloy of Ag on Pt(111). Based on a change
of the work function of 25\,meV across the atomically flat terraces we can
distinguish Pt rich f... | 1505.00020v3 |
2015-08-19 | Phason space analysis and structure modeling of 100 A-scale dodecagonal quasicrystal in Mn-based alloy | The dodecagonal quasicrystal classified into the five-dimensional space group
P126/mmc, recently discovered in a Mn-Cr-Ni-Si alloy, has been analyzed using
atomic-resolution spherical aberration-corrected electron microscopy, i.e.
high-angle annular dark-field scanning transmission electron microscopy
(HAADF-STEM) and ... | 1508.04563v1 |
2015-09-15 | Formation of hexagonal Boron Nitride on Graphene-covered Copper Surfaces | Graphene-covered copper surfaces have been exposed to borazine, (BH)3(NH)3,
with the resulting surfaces characterized by low-energy electron microscopy.
Although the intent of the experiment was to form hexagonal boron nitride
(h-BN) on top of the graphene, such layers were not obtained. Rather, in
isolated surface are... | 1509.04531v2 |
2015-09-28 | Thermoelectric properties of rare earth filled type-I like Clathrate, Dy8Al16Si30 | Type-I clathrates with a cage structure are known to be of importance for
thermoelectric applications as the cage can be filled with a guest atom which
leads to reduced thermal conductivity. Among the type-I clathrates, Si-based
alloys are of relevance for high temperature application and most importantly
because they ... | 1509.08277v1 |
2015-10-09 | Magnetic anisotropy of polycrystalline high-temperature ferromagnetic Mn$_x$Si$_{1-x}$ ($x\approx0.5$) alloy films | A set of thin film Mn$_x$Si$_{1-x}$ alloy samples with different manganese
concentration x = 0.44 - 0.63 grown by the pulsed laser deposition (PLD) method
onto the Al$_2$O$_3$(0001) substrate was investigated in the temperature range
4 - 300 K using ferromagnetic resonance (FMR) measurements in the wide range of
freque... | 1510.02634v1 |
2015-10-30 | Structural-disorder and its effect on the mechanical properties in single-phase TaNbHfZr high-entropy alloys | Equiatomic TaNbHfZr refractory high-entropy alloys (HEAs) were synthesized by
arc-melting. The HEAs were annealed at 1800{\deg}C for different times, at
maximum up to 8 days. Their on average body-centered cubic (bcc),
solid-solution structure was confirmed by X-ray (XRD) and neutron (ND)
diffraction, respectively. The... | 1510.09047v1 |
2015-12-06 | Bayesian inference and model comparison for metallic fatigue data | In this work, we present a statistical treatment of stress-life (S-N) data
drawn from a collection of records of fatigue experiments that were performed
on 75S-T6 aluminum alloys. Our main objective is to predict the fatigue life of
materials by providing a systematic approach to model calibration, model
selection and ... | 1512.01779v1 |
2015-12-11 | Ultra-low magnetic damping of a metallic ferromagnet | The phenomenology of magnetic damping is of critical importance for devices
that seek to exploit the electronic spin degree of freedom since damping
strongly affects the energy required and speed at which a device can operate.
However, theory has struggled to quantitatively predict the damping, even in
common ferromagn... | 1512.03610v1 |
2016-01-22 | Phase stability, local chemical disorder and its effect on the mechanical properties of refractory high-entropy alloys | Equiatomic TaNbHfZr and TaNbHfZrTi high-entropy alloys (HEAs) have been
investigated for their phase stability, short-range clustering (SRC) type
chemical ordering, other structural phenomena and and the effects on
strengthening. Ab-initio calculations have been done to determine the
thermodynamic stability parameters.... | 1601.06015v1 |
2016-04-02 | Manufacturing of Aluminum Composite Material Using Stir Casting Process | Manufacturing of aluminum alloy based casting composite materials via stir
casting is one of the prominent and economical route for development and
processing of metal matrix composites materials. Properties of these materials
depend upon many processing parameters and selection of matrix and
reinforcements. Literature... | 1604.01251v1 |
2016-04-11 | A fully relativistic description of spin-orbit torques by means of linear response theory | Symmetry and magnitude of spin-orbit torques (SOT), i.e., current-induced
torques on the magnetization of systems lacking inversion symmetry, are
investigated in a fully relativistic linear response framework based on the
Kubo formalism. By applying all space-time symmetry operations contained in the
magnetic point gro... | 1604.02798v1 |
2016-04-26 | Unconventional superconductivity in low density electron systems and conventional superconductivity in hydrogen metallic alloys under pressure | In a short review-article we first discuss the results, which are mainly
devoted to the generalizations of the famous Kohn-Luttinger mechanism of
superconductivity in purely repulsive fermion systems at low electron
densities. In the context of repulsive-U Hubbard model and Shubin-Vonsovsky
model we consider briefly th... | 1604.07583v2 |
2016-05-11 | Faceted interfaces: a key feature to quantitative understanding of transformation morphology | Faceted interfaces are a key feature in self-resembling morphologies of many
microstructures generated from solid state phase transformations.
Interpretations, predictions and simulations of the faceted morphologies remain
a challenge, especially for systems in which irrational orientation
relationships (ORs) between t... | 1605.03249v2 |
2016-05-23 | Electronic Structure of FeAl Alloy Studied by Resonant Photoemission Spectroscopy and Ab Initio Calculations | Resonant photoemission spectroscopy has been used to investigate the
character of Fe 3d states in FeAl alloy. Fe 3d states have two different
character, first is of itinerant nature located very close to the Fermi level,
and second, is of less itinerant (relatively localized character), located
beyond 2 eV below the Fe... | 1605.06967v1 |
2016-06-03 | Spectral descriptors for bulk metallic glasses based on the thermodynamics of competing crystalline phases | Metallic glasses have attracted considerable interest in recent years due to
their unique combination of superb properties and processability. Predicting
bulk metallic glass formers from known parameters remains a challenge and the
search for new systems is still performed by trial and error. It has been
speculated tha... | 1606.01162v2 |
2016-06-08 | Role of Hydrogen in the Electronic Properties of CaFeAsH-based Superconductors | The electronic and magnetic properties of the new hydride superconductor
CaFeAsH, which superconducts up to 47 K when electron-doped with La, and the
isovalent alloy system CaFeAsH$_{1-x}$F$_x$ are investigated using density
functional based methods. The $\vec Q = (\pi,\pi,0)$ peak of the nesting
function $\xi(\vec q)$... | 1606.02432v1 |
2016-08-19 | Self-optimizing layered hydrogen evolution catalyst with high basal-plane activity | Hydrogen is a promising energy carrier and key agent for many industrial
chemical processes1. One method for generating hydrogen sustainably is via the
hydrogen evolution reaction (HER), in which electrochemical reduction of
protons is mediated by an appropriate catalyst-traditionally, an expensive
platinum-group metal... | 1608.05755v1 |
2016-09-02 | Influence of Cu deposition potential on the giant magnetoresistance and surface roughness of electrodeposited Ni-Co/Cu multilayers | It has been shown previously for electrodeposited Co/Cu multilayers that the
single-bath electrodeposition process can be optimized from an electrochemical
point of view in order to avoid unwanted Co dissolution and incorporation of Co
in the non-magnetic layer during the Cu deposition pulse. In the present work,
elect... | 1609.00597v1 |
2016-09-06 | Quasiperiodic Frank-Kasper phases derived from the square-triangle dodecagonal tiling | Frank-Kasper (F-K) phases form an important set of large-cell crystalline
structures describing many inter-metallic alloys. They are usually described in
term of their atomic environments, with atoms having $12, 14, 15$ and $16$
neighbours, coded into the canonical $Z_p$ cells (with $p$ the coordination
number), the ca... | 1609.01624v1 |
2016-09-17 | Enhanced visible light absorption in ZnO/GaN heterostructured nanofilms | ZnO/GaN alloys exhibit exceptional photocatalyst applications owing to the
flexibly tunable band gaps that cover a wide range of the solar spectrum, and
thus have attracted extensive attentions over the past few years. In this
study, first-principles calculations were employed to investigate structural
stabilities and ... | 1609.05340v2 |
2016-10-05 | Electric field gradients in Zr$_8$Ni$_{21}$ and Hf$_8$Ni$_{21}$ intermetallic compounds; Results from perturbed angular correlation measurements and first-principles density functional theory | Numerous technological applications of Ni-based Zr and Hf intermetallic
alloys promoted comprehensive studies in Zr$_8$Ni$_{21}$ and Hf$_8$Ni$_{21}$ by
perturbed angular correlation (PAC) spectroscopy, which were not studied
earlier until this report. The different phases produced in the samples have
been identified by... | 1610.01414v3 |
2016-10-26 | Influences of Granular Constraints and Surface Effects on the Heterogeneity of Elastic, Superelastic, and Plastic Responses of Polycrystalline Shape Memory Alloys | Deformation heterogeneities within microstructures of polycrystalline shape
memory alloys (SMAs) during superelastic stressing are studied using both
experiments and simulations. In situ X-ray diffraction, specifically the
far-field high energy diffraction microscopy (ff-HEDM) technique was used to
non-destructively me... | 1610.08429v3 |
2016-11-09 | Understanding and reducing deleterious defects in metastable alloy GaAsBi | Technological applications of novel metastable materials are frequently
inhibited by abundant defects residing in these materials. Using
first-principles methods we investigate the point defect thermodynamics and
phase segregation in the technologically-important metastable alloy GaAsBi. Our
calculations predict defect... | 1611.03031v1 |
2016-11-10 | Magnetism and ultra-fast magnetization dynamics of Co and CoMn alloys at finite temperature | Temperature-dependent magnetic experiments like pump-probe measurements
generated by a pulsed laser have become a crucial technique for switching the
magnetization in the picosecond time scale. Apart from having practical
implications on the magnetic storage technology, the research field of
ultrafast magnetization pos... | 1611.03541v2 |
2017-01-11 | The Robustness of Cluster Expansion: Assessing the Roles of Relaxation and Numerical Error | Cluster expansion (CE) is effective in modeling the stability of metallic
alloys, but sometimes cluster expansions fail. Failures are often attributed to
atomic relaxation in the DFT-calculated data, but there is no metric for
quantifying the degree of relaxation. Additionally, numerical errors can also
be responsible ... | 1701.03080v1 |
2017-01-19 | Dynamics and control of gold-encapped gallium arsenide nanowires imaged by 4D electron microscopy | Eutectic related reaction is a special chemical/physical reaction involving
multiple phases, solid and liquid. Visualization of phase reaction of composite
nanomaterials with high spatial and temporal resolution provides a key
understanding of alloy growth with important industrial applications. However,
it has been a ... | 1701.05310v2 |
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