Magnetostructural transitions with a critical behavior in Y-doped MnCoGe compounds

被引：23
作者：
Imam, H. [1 ]
Zhang, H. G. [1 ]
Pan, W. J. [1 ]
Song, B. T. [1 ]
Shi, J. H. [1 ]
Yue, M. [1 ]
机构：
[1] Beijing Univ Technol, Minist Educ China, Key Lab Adv Funct Mat, Coll Mat Sci & Engn, Beijing 100124, Peoples R China
来源：
INTERMETALLICS | 2019年 / 107卷
基金：
中国国家自然科学基金; 北京市自然科学基金;
关键词：
Magnetocaloric effect; MnCoGe; Rare earth; Magnetic entropy change; Magnetostructural transition; MAGNETIC ENTROPY CHANGE; PHASE-DIAGRAM; TRANSFORMATION; CO;
D O I：
10.1016/j.intermet.2019.01.008
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：
The behavior of magnetic and structural transitions in Y substituted MnCoGe system is investigated in this study. Both Mn and Ge deficiencies in MnCoGe phase are induced by a single-site Y doping. The structural transition temperature thus shifts to lower temperatures and creates a Curie temperature window as wide as 86 K. The largest magnetic entropy change of about 15.6 J/kg.K and refrigerant capacity of about 132.8 J/kg are obtained in these compounds. The samples at the boundary of the temperature window show a critical phenomenon, which is characterized by a magnetostructural transition during the cooling process and separate magnetic plus structural transitions during the heating process. This makes it possible to determine the contribution from the magnetic transition to the total entropy change in magnetostructural transition, which is 23-26% in present system.
引用
收藏
页码：53 / 59
页数：7
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