Exploring the details of the martensitic phase transition and magnetocaloric effect of CoMnGe0.95Ga0.05 by synchrotron and magnetic measurements
Exploring the details of the martensitic phase transition and magnetocaloric effect of CoMnGe0.95Ga0.05 by synchrotron and magnetic measurements
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DOI：
10.1016/j.jallcom.2012.05.072
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发表时间：
2012-11-05
影响因子：
6.2
通讯作者：
Ehrenberg, H.
中科院分区：
文献类型：
--
作者：
Dincer, I.;Yuzuak, E.;Ehrenberg, H.
用电子显微镜、量热、同步辐射和磁测量等方法研究了CoMnGe_（0.95）Ga_（0.05）的结构、磁性和磁热性质。Ga替代Ge使马氏体相变温度从650 K降低到315 K。CoMnGe_（0.95）Ga_（0.05）在高于马氏体相变温度时具有六方结构（空间群P6（3）/mmc），在低于该温度时具有正交结构（空间群Pnma）。在马氏体转变温度附近的加热和冷却过程中进行磁化强度测量的磁场依赖性，以确定磁热效应。在1 T磁场下，与马氏体相变温度相关的磁熵变可达-5.2Jkg（-1）K-1。(C)2012爱思唯尔有限公司版权所有。
The structural, magnetic and magnetocaloric properties of CoMnGe0.95Ga0.05 have been investigated by using electron microscopy, calorimetric, synchrotron and magnetic measurements. The substitution of Ga for Ge leads to decreasing on the martensitic transition temperature from 650 K to 315 K. CoMnGe0.95Ga0.05 has hexagonal structure (space group P6(3)/mmc) above the martensitic transition temperature and orthorhombic structure (space group Pnma) below this temperature. The magnetic field dependence of magnetization measurements are performed in the heating and cooling processes around the martensitic transition temperature to determine magnetocaloric effect. It is observed that the magnetic entropy change associated with the martensitic transition temperature can be as high as -5.2 J kg(-1) K-1 in field of 1 T. (C) 2012 Elsevier B.V. All rights reserved.