Magnetostructural transition and adiabatic temperature change in Mn-Co-Ge magnetic refrigerants

被引：52

作者：

Liu, J. ^{[1
]}

Skokov, K. ^{[1
]}

Gutfleisch, O. ^{[1
,2
]}

机构：

[1] Inst Met Mat, IFW Dresden, D-01171 Dresden, Germany

[2] Tech Univ Darmstadt, Dept Mat Sci, D-64287 Darmstadt, Germany

来源：

SCRIPTA MATERIALIA | 2012年 / 66卷 / 09期

关键词：

Mn-Co-Ge; Magnetocaloric effect; Adiabatic temperature change; Magnetostructural transition; ENTROPY CHANGE; MARTENSITIC-TRANSFORMATION;

D O I：

10.1016/j.scriptamat.2012.01.048

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Crystal structure, structural and magnetic transitions were investigated in a series of MnCo0.95Gex (x = 0.95, 0.97, 1.0) alloys. A first-order magnetic transition was observed in MnCo0.95Ge0.97 with a large thermal and magnetic hysteresis, while the other two composition alloys undergo a second-order ferromagnetic transition. The adiabatic temperature change for MnCo0.95Ge0.97 strongly relies on the sample history (heating or cooling protocols) due to the competition of structural and magnetic transitions. The structural contribution works against the magnetic contribution to the total magnetocaloric effect. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：642 / 645

页数：4

共 29 条

[1]

Bazela W., 1976, PHYS STATUS SOLIDI A, V8, P21

[2]

BECKMAN O, 1991, HDB MAGNETIC MAT, V6, pCH3

[3] A review on Mn based materials for magnetic refrigeration:: Structure and properties [J].