Tuning Martensitic Phase Transition by Non-Magnetic Atom Vacancy in MnCoGe Alloys and Related Giant Magnetocaloric Effect
Tuning Martensitic Phase Transition by Non-Magnetic Atom Vacancy in MnCoGe Alloys and Related Giant Magnetocaloric Effect
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通过 MnCoGe 合金中非磁性原子空位调节马氏体相变及相关巨磁热效应
DOI：
10.1088/0256-307x/33/7/077502
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发表时间：
2016-07-01
影响因子：
3.5
通讯作者：
Ren, Ya-Jie
中科院分区：
文献类型：
--
作者：
Bao, Li-Fu;Huang, Wen-Deng;Ren, Ya-Jie
利用X射线衍射和磁性测量研究了非磁性原子空位对MnCoGe 1-x合金的结构、马氏体相变以及相应的磁热效应的影响。非磁性原子空位的引入导致马氏体相变温度的降低，并实现了磁性相变和马氏体相变可以一起调谐的温度窗口。此外，还得到了伴随着磁-结构耦合相变的巨磁热效应。在Δ H = 2，5，7 T时J.kgMnCoGe_（0.97）的磁熵变峰值分别为-13.9，-35.1和-47.4K ~（-1）。
The effects of non-magnetic atom vacancy on structural, martensitic phase transitions and the corresponding magnetocaloric effect in MnCoGe1-x alloys are investigated using x-ray diffraction and magnetic measurements. The introduction of non-magnetic atom vacancy leads to the decrease of the martensitic transition temperature and realizes a temperature window where magnetic and martensitic phase transitions can be tuned together. Moreover, the giant magnetocaloric effect accompanied with the coupled magnetic-structural transition is obtained. It is observed that the peak values of magnetic entropy change of MnCoGe0.97 are about -13.9, -35.1 and -47.4 J.kg(-1) K-1 for Delta H = 2, 5, 7 T, respectively.