对具有高硬度和铁磁性的多功能Mn2B3材料的第一原则研究
Chunhong Xu1, Kuo Bao2, Sheng Wang1
1School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing, 163318, China. xuchunhong@nepu.edu.cn.
Physical chemistry chemical physics : PCCP
|April 5, 2024
概括
这项研究研究了二化 (Mn2B3),预测了其在压力下稳定的相位. 这些相表现出优良的机械性能和铁磁性,表明它们具有作为多功能材料的潜力.
科学领域:
- 物理与材料科学 物理与材料科学
- 固态化学 固态化学
- 计算材料科学科学 计算材料科学
背景情况:
- 过渡金属化物 (TM2B3) 是广泛研究的材料.
- 二化物 (Mn2B3) 在-系统中没有实验性观察到.
- 了解新材料的高压行为对于发现新应用至关重要.
研究的目的:
- 在高压下以计算方式研究Mn2B3的结构,机械和磁性特性.
- 预测Mn2B3的稳定相及其过渡压力.
- 探索Mn2B3作为多功能材料的潜力.
主要方法:
- 使用密度函数理论 (DFT) 的计算.
- 使用进化算法和ab initio随机结构搜索来预测阶段.
- 通过弹性张量计算来评估机械性能.
- 使用斯通纳模型和DFT分析了磁性特性.
主要成果:
- 在高达200GPa的压力下确定了三种稳定的Mn2B3相 (Cmcm,C2/m,C2/c).
- Cmcm-和C2/m-Mn2B3具有六个成员的环,而C2/c-Mn2B3呈现波形链.
- 所有预测的相都表现出良好的机械性能,归因于强大的B-B共价键.
- 这些材料表现出铁磁性,其磁矩在不同的计算方法中一致.
结论:
- 预测Mn2B3在高压下是一个稳定的材料,存在于不同的结构阶段.
- 强大的B-B共价键是Mn2B3.3的结构稳定性和硬度的关键.
- 预测的多功能性质,包括机械强度和铁磁性,强调Mn2B3作为先进材料应用的有希望的候选者.
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