Magnetocaloric effect in Mn1-x CoGeSi x alloys

被引：16

作者：

Si, Xiaodong ^{[1
]}

Liu, Yongsheng ^{[1
]}

Shen, Yulong ^{[1
]}

Yu, Wenying ^{[1
]}

Ma, Xinxiu ^{[1
]}

Zhang, Zhanxian ^{[1
]}

Xu, Yan ^{[1
]}

Gao, Tian ^{[1
]}

机构：

[1] Shanghai Univ Elect Power, Inst Solar Energy, Shanghai 200090, Peoples R China

来源：

JOURNAL OF MATERIALS SCIENCE | 2018年 / 53卷 / 05期

关键词：

MAGNETIC PHASE-TRANSITIONS; MAGNETOSTRUCTURAL TRANSITION; CRITICAL-BEHAVIOR; NICKEL; FIELD;

D O I：

10.1007/s10853-017-1783-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A comprehensive study of the magnetic transition, magnetocaloric effect, critical behavior, and universal behavior for Mn1-x CoGeSi (x) (x = 0.02, 0.04, 0.06, and 0.08) system is reported. The Curie temperature increases from 270 to 289 K as the Si doping increases, while the maximum magnetic entropy change (|Delta S (M)|) decreases from 3.08 to 2.67 J/kg K (5 T), consistent with the shift of magnetic moment. Various techniques are used to determine the critical exponents and confirm the validity of the obtained critical exponents, revealing long-range interactions in this system. The Landau theory and universal behavior are used to evidence the second-order nature of the transition. Moreover, the new method to estimate the spontaneous magnetization estimated from the magnetic entropy change is verified.

引用

页码：3661 / 3671

页数：11

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