用周期表的三体紧密结合模型对材料特性进行快速准确的预测
Kevin F Garrity1, Kamal Choudhary1
1Materials Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
概括
我们开发了一种具有65个元素的通用紧固结合模型,改进了材料性质预测. 这种精确的量子力学方法使用大型数据库,并包括复杂的相互作用,以获得更广泛的适用性.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 参数化的紧固结合模型为材料特性提供了高效的量子力学预测.
- 现有的模型受到稀疏的参数集和简化的交互术语 (例如,只有两体) 的限制.
- 这些局限性阻碍了常规应用,并降低了各种化学结合类型的准确性.
研究的目的:
- 开发一套适用于各种元素和材料的通用紧密结合参数.
- 通过结合先进的相互作用术语和自我一致的电荷转移来提高紧密结合模型的准确性和适用性.
- 创建一个公开可用的数据库和工具,以便在材料科学研究中广泛使用.
主要方法:
- 编制了一个密度函数理论 (DFT) 数据库,包含大约100万种材料.
- 为65个元素安装了一套通用的紧密结合参数,包括两体和三体相互作用.
- 实施了一种自我一致的电荷转移机制和一个学习框架,以代的方式结合新的低能耗结构.
主要成果:
- 成功安装了65个元素及其二进制组合的通用紧密结合参数集.
- 该模型使用单个参数集准确地描述金属,共价和离子键.
- 代测试和将新结构添加到合适数据集中显示出更好的预测能力.
结论:
- 开发的通用紧固结合模型为预测材料性质提供了准确和高效的方法.
- 包含三体相互作用和自我一致的电荷转移显著提高了模型的准确性和适用性.
- 公开发布的数据库和工具促进了计算材料科学的更广泛采用和进步.
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