Update README.md

README.md

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----
-license: apache-2.0
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+---
+license: apache-2.0
+---
+
+# Experimental pXRD Dataset (Subset of opXRD)
+
+This repository open-sources **labeled experimental powder X-ray diffraction (pXRD) data**, released as a **curated subset of the opXRD database**, with data contributions from **HKUST (Guangzhou)**.
+
+The dataset is intended for **materials informatics, phase identification, and AI-driven XRD analysis**, and is released for research and educational use.
+
+---
+
+## Dataset Composition
+
+The repository contains a total of **1,277 experimental pXRD patterns**, including:
+
+- **21 original pXRD patterns** measured using **XRed**  
+  *(HKUST-A dataset)*
+
+- **499 labeled oxpXRD samples**  
+  *(HKUST-B dataset)*
+
+- **752 processed pXRD patterns**, consisting of:
+  - **651 pXRD patterns** processed from the **opXRD database**
+  - **101 supplemental experimental pXRD patterns** from **HKUST (Guangzhou)**
+
+---
+
+## Summary
+
+| Source | Number of pXRD Patterns |
+|------|--------------------------|
+| HKUST-A (XRed) | 21 |
+| HKUST-B (labeled oxpXRD) | 499 |
+| opXRD (processed) | 651 |
+| HKUST-GZ (supplemental) | 101 |
+| **Total** | **1,277** |
+
+---
+
+## Usage and Citation
+
+If you use this dataset in your research, **please cite both this repository and the opXRD paper**:
+
+```bibtex
+@dataset{cao2025opxrd_hkust_expdata,
+  title        = {Experimental pXRD Dataset from HKUST (Guangzhou): A Subset of opXRD},
+  author       = {Cao, Bin},
+  year         = {2025},
+  publisher    = {Hugging Face Datasets},
+  url          = {https://huggingface.co/datasets/caobin/opxrd_hkust_expdata},
+  license      = {Apache-2.0}
+}
+
+
+
+```bibtex
+@article{hollarek2025opxrd,
+  title={opXRD: Open Experimental Powder X-Ray Diffraction Database},
+  author={Hollarek, Daniel and Schopmans, Henrik and {\"O}streicher, Jona and Teufel, Jonas and Cao, Bin and Alwen, Adie and Schweidler, Simon and Singh, Mriganka and Kodalle, Tim and Hu, Hanlin and others},
+  journal={Advanced Intelligent Discovery},
+  pages={202500044},
+  year={2025},
+  publisher={Wiley Online Library}
+}