Structural and magnetic phase transitions in shape-memory alloys Ni 2+x Mn 1-x Ga
Structural and magnetic phase transitions in shape-memory alloys Ni 2+x Mn 1-x Ga
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DOI：
10.1103/physrevb.59.1113
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发表时间：
1999
影响因子：
3.7
通讯作者：
A. Vasil'ev;A. Bozhko;V. V. Khovaĭlo-V.;I. Dikshtein;V. Shavrov;V. Buchel'nikov;M. Matsumoto;S. Suz
中科院分区：
文献类型：
--
作者：
A. Vasil'ev;A. Bozhko;V. V. Khovaĭlo-V.;I. Dikshtein;V. Shavrov;V. Buchel'nikov;M. Matsumoto;S. Suz
Heusler型合金Ni2+xMn1−xGa在铁磁性状态下表现出良好的形状记忆特性，这意味着该材料的马氏体转变温度低于居里点。组成的变化使这些特征温度相互接近。为了研究这一行为，测量了比热、交流磁化率和直流电阻率。从理论上得到了描述可能的结构相变和磁相变的立方铁磁体的相图。该图与Ni2+xMn1−xGa的实验数据进行了比较。估算了磁场对所研究合金马氏体相变温度的影响。
The Heusler-type alloy Ni 2+ x Mn 1− x Ga exhibits well defined shape memory properties in a ferromagnetic state, which means that the martensitic transition temperature is lower than the Curie point of this material. The change of composition makes these characteristic temperatures approach each other. To study this behavior, the measurements of specific heat, ac magnetic susceptibility, and dc resistivity were performed. The phase diagram of the cubic ferromagnet describing possible structural and magnetic transitions is obtained theoretically. This diagram is compared with experimental data on Ni 2+ x Mn 1− x Ga. An estimate is given of the magnetic-field influence on the temperature of martensitic transformation in the studied alloys.