Realization of magnetostructural coupling in a high temperature region in Mn0.85Co0.3Ni0.85Si1-xGax system
Realization of magnetostructural coupling in a high temperature region in Mn0.85Co0.3Ni0.85Si1-xGax system
复制标题
Mn0.85Co0.3Ni0.85Si1-xGax体系高温区磁结构耦合的实现
DOI：
10.1016/j.jallcom.2017.10.295
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发表时间：
2018
影响因子：
6.2
通讯作者：
Lu Guowen
中科院分区：
文献类型：
--
作者：
Kasimov Damir;Liu Jun;Gong Yuanyuan;Xu Guizhou;Xu Feng;Lu Guowen
在替代的MnNiSi基合金中，铁磁六方相和顺磁六方相之间的一阶磁结构转变已被广泛研究。然而，由于取代能级较大，正交相的居里温度显著降低，导致一个缩小或封闭的温度区间，在这个温度区间内，顺磁六方相和铁磁正交相之间可以发生磁结构转变。本文报道了一种三位点共取代体系：Mn0.85Co0.3Ni0.85Si1-xGax。在该体系中，低取代度可有效降低结构转变温度。在此基础上，使正交相的居里温度保持在较高的值。在303K的温度区间内发生磁结构转变，该温度区间的上限高达542K，是MnM‘X基化合物中最高的。
First-order magnetostructural transition between ferromagnetic orthorhombic and paramagnetic hexagonal phases has been widely investigated in substituted MnNiSi-based alloys. However, due to the large substitution level, the Curie temperature of the orthorhombic phase decreases remarkably, leading to a shrunken or closed temperature interval in which the magnetostructural transition between paramagnetic hexagonal and ferromagnetic orthorhombic phases can take place. In this paper, a three-site co-substitution system, Mn0.85Co0.3Ni0.85Si1-xGax, was reported. In this system, the structural transformation temperature can be efficiently reduced with a low level of substitution. Based on this improvement, the Curie temperature of the orthorhombic phase maintains at a high value. The magnetostructural transition can be established in a temperature interval of 303 K. The upper limit of this temperature interval is as high as 542 K, which is the highest among the MnM’X-based compounds.