测试r2SCAN密度函数用于固体的热力学稳定性,并没有范德瓦尔斯校正
Manish Kothakonda1, Aaron D Kaplan2, Eric B Isaacs3
1Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana70118, United States.
r2SCAN元一般化梯度近似 (meta-GGA) 为材料发现提供了准确和稳定的热力学属性预测. 它提高了在金属间系统中形成的度的SCAN精度,使其成为研究人员可靠的工具.
科学领域:
- 计算材料科学科学 计算材料科学
- 固态物理 固态物理
- 量子化学 是一个量子化学.
背景情况:
- 准确的热力学属性预测对于材料发现至关重要.
- 强烈受约束和适当规范 (SCAN) 的元泛化梯度近似 (meta-GGA) 提供了高精度,但可能存在数值稳定性问题.
- r2SCAN修订旨在平衡数字稳定性和高一般精度.
研究的目的:
- 评估r2SCAN元GGA在描述固态热力学特性方面的性能.
- 为了将r2SCAN与SCAN,PBE和分散校正变体 (SCAN+rVV10,r2SCAN+rVV10) 进行比较.
- 评估这些方法的形成和分解度,平衡体积和带间隙的准确性.
主要方法:
- 对1000多种固体的热力学特性进行评估.
- 使用了r2SCAN,SCAN,PBE,SCAN+rVV10和r2SCAN+rVV10. 这三种方法.
- 形成,分解,平衡体积和带间隙的分析.
主要成果:
- r2SCAN的准确性与SCAN相美,并且往往比SCAN更好.
- 形成的平均绝对误差从GGA显著降低到meta-GGA水平.
- r2SCAN显示在金属间系统的形成度方面比SCAN有所改善.
- 分散校正的SCAN+rVV10可以恶化形成度,并提供最小的细胞体积校正.
- r2SCAN+rVV10显示的形成度略低,但细胞体积略高于r2SCAN.
结论:
- r2SCAN是一种稳定且准确的元GGA,适用于一般材料发现.
- 推使用r2SCAN和r2SCAN+rVV10来预测热力学特性.
- 虽然GGA可以与某些系统的meta-GGAs进行比较,但meta-GGAs提供了整体错误减少.
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