Tuning the magnetostructural transformation in slightly Ni-substituted MnCoGe ferromagnet

被引：19
|
作者：
Yang, Sheng [1 ,2 ]
Song, Ying [1 ]
Han, Xingqi [1 ,2 ]
Ma, Shengcan [1 ]
Yu, Kun [1 ,2 ]
Liu, Kai [1 ,2 ]
Zhang, Zhishuo [1 ,2 ]
Hou, Dong [3 ]
Yuan, Matthew [4 ,5 ]
Luo, Xiaohua [1 ]
Chen, Changcai [1 ]
Zhong, Zhenchen [1 ]
机构：
[1] Jiangxi Univ Sci & Technol, Jiangxi Key Lab Rare Earth Magnet Mat & Devices, IREMMD, Ganzhou 341000, Peoples R China
[2] Jiangxi Univ Sci & Technol, Sch Mat Sci & Engn, Ganzhou 341000, Peoples R China
[3] Global Energy Interconnect Res Inst Co Ltd, Beijing 102211, Peoples R China
[4] Raenin Mat Co Ltd, Ganzhou 341000, Peoples R China
[5] Dublin Coffman High Sch, Dublin, OH 43017 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 773卷
基金：
中国国家自然科学基金;
关键词：
Magnetostructural transformation; Ni-substitution; Temperature window; Metamagnetic martensitic transformation; Magnetocaloric effect; MAGNETIC ENTROPY CHANGE; MARTENSITIC-TRANSFORMATION; METAMAGNETIC TRANSITION; GIANT; RE; TM;
D O I：
10.1016/j.jallcom.2018.09.266
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this work, the Mn1-xNixCoGe (0.01 <= x <= 0.075) alloys are prepared. By slight substitution of Mn upon Ni element, the magnetic transition and structural transformation of stoichiometric MnCoGe ferromagnet are controlled to coincide. Accordingly, the coupled magnetostructural transformation occurs during the wide temperature window of similar to 91.5 K covering room temperature from the ferromagnetic TiNiSi-type to paramagnetic Ni2In-type state. Strikingly, a magnetic-field-driven metamagnetic martensitic transformation is observed in Mn0.975Ni0.025CoGe alloy. As a result, large room temperature magnetocaloric effects are obtained including large magnetic entropy change of similar to 30.3 Jkg(-1)K(-1) for sample with x = 0.025 and large refrigeration capacity of similar to 276.8 Jkg(-1) for x = 0.035 under the applied field change of Delta H= 0-7 T. The influence of slight Ni-substitution for Mn on the magnetic and magnetocaloric properties of MnCoGe alloy is studied and the origins are discussed. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：1114 / 1120
页数：7
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