Microstructure, magnetic properties and magnetocaloric effect in melt-spun Ni-Mn-Ga ribbons

被引：43
|
作者：
Rao, N. V. Rama [1 ,2 ]
Gopalan, R. [2 ]
Chandrasekaran, V. [2 ]
Suresh, K. G. [1 ]
机构：
[1] Indian Inst Technol, Dept Phys, Bombay 400076, Maharashtra, India
[2] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 478卷 / 1-2期
关键词：
Magnetocaloric; Rapid solidification; Magnetic measurements; ENTROPY CHANGE; TRANSITION; ALLOYS; REFRIGERATION;
D O I：
10.1016/j.jallcom.2008.12.015
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：
Structural transformation, microstructure and magnetocaloric effect (MCE) were investigated in melt-spun Ni55Mn20.6Ga24.4 and Ni55Mn19.6Ga25.4 ribbons. Magnetic and thermal studies of the ribbons revealed the occurrence of simultaneous structural and magnetic transitions near room temperature with a narrow thermal hysteresis of magnetization approximate to 2 K. Maximum entropy changes (Delta S-M) of -9.5 and -10.4J/kg K have been obtained at 309 K for a field change of 2 T in Ni55Mn20.6Ga25.4 and Ni55Mn19.6Ga25.4 ribbons, respectively. The Ni55Mn19.6Ga25.4 ribbon exhibits refrigeration capacity (RC) of 47 J/kg with low average hysteresis loss (approximate to 1.5J/kg) at the merged structural and magnetic transition temperature. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：59 / 62
页数：4
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