为了模拟碳化的不同原子间潜力的比较和评估
Jiajie Yu1, Xiyue Dai1, Jiayuan Li1
1Center on Nanoenergy Research, Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems Integration, Carbon Peak and Neutrality Science and Technology Development Institute, School of Physical Science & Technology, Guangxi University, Nanning 530004, China.
选择正确的原子间电位是碳化 (SiC) 模拟的关键. 这项研究评估了SiC的多种潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 计算材料科学科学 计算材料科学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 原子间潜能对于碳化 (SiC) 的分子动力学 (MD) 模拟至关重要.
- 现有潜能对六角SiC属性的准确描述仍然未经验证.
- 需要对各种SiC多种类型的潜力进行全面评估.
研究的目的:
- 评估各种原子间电位的准确性,以模拟SiC的机械,热和缺陷特性.
- 将MD模拟结果与密度函数理论 (DFT) 和实验数据进行比较.
- 为了指导选择合适的潜力用于SiC模拟.
主要方法:
- 对四种SiC结构 (3C,2H,4H和6H-SiC) 进行了分子动力学 (MD) 模拟.
- 测试了多个原子间潜力,包括T05,Vashishta,EDIP,MEAM,T90,GW和T94.
- 计算的属性与DFT和实验结果进行了比较.
主要成果:
- T05电位准确地描述了SiC的弹性常数和模量.
- 瓦希斯塔,EDIP和MEAM电位捕获振动特性;T90在导热性方面表现出色.
- 对于六边形SiC点缺陷形成能量,EDIP是有利的;对于空位迁移,GW是有利的.
- T90和T94预测了表面能量;Vashishta准确地模拟了堆叠断层.
结论:
- 不同的电位显示特定SiC属性的不同强度.
- 对于弹性特性,建议使用T05电位.
- 瓦希斯塔,EDIP,MEAM,T90,GW和T94潜力适用于特定的热,缺陷,表面和堆叠故障模拟.
- 这项研究有助于为SiC模拟选择最佳的原子间潜力.
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