在Mn0.9Co0.1NiGe半海斯勒合金中的压力调节反向马氏体转化
Edileide Alves Dos Santos1, Jessica Kamily Pereira França1, Adenilson Oliveira Dos Santos1
1Centro de Ciências de Imperatriz (CCIM), Universidade Federal do Maranhão-UFMA, Maranhão, Brazil.
概括
压力和温度在Mn$_{0.9}$Co$_{0.1}$NiGe合金中诱导反向马氏体变化,由异型晶格收缩驱动. 这种过渡与负热膨胀和磁相变化有关.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 晶体学 晶体学是指结晶学.
背景情况:
- 半斯勒合金是热电和磁应用的有前途的材料.
- 了解外部刺激下的结构阶段过渡对于材料设计至关重要.
研究的目的:
- 为了研究高压下Mn$_{0.9}$Co$_{0.1}$NiGe的结构性质.
- 阐明结构转换,负热膨胀和磁性特性之间的关系.
主要方法:
- 同步角分散式X射线衍射 (XRD) 高达12 GPa.
- 可变的温度测量从100K到160K.
- 分析格子参数,阶段分数和散装模量.
主要成果:
- 在环境条件下,Mn$_{0.9}$Co$_{0.1}$NiGe呈现出六边形的NiIn$_{2}$型结构.
- 在100K发生马氏体转变为正方体TiNiSi型结构的过程.
- 增加的压力会导致反向的马氏体变化,有利于六角形阶段.
- 观察到异型晶格收缩和显著的负热膨胀 (NTE).
- 确定了六边形和正角形相的散装模块.
结论:
- 在Mn$_{0.9}$Co$_{0.1}$NiGe中,反向的马氏体转变是由异型晶格收缩驱动的.
- 这种结构性行为与负热膨胀密切相关.
- 这些发现表明,异性收缩在驱动该系统中的磁相转换方面起着至关重要的作用.
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