Influence of extra La and annealing temperature on microstructure and magnetocaloric properties of La-Fe-Co-Si alloys

被引：15
|
作者：
Zhang, Zhongtian [1 ,2 ,3 ]
He, Chun [1 ,2 ]
Zhang, Mingxiao [1 ,2 ]
Liu, Jian [1 ,2 ]
机构：
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, Ningbo 315201, Zhejiang, Peoples R China
[3] Univ Sci & Technol China, Nano Sci & Technol Inst, Suzhou 215123, Peoples R China
来源：
PHYSICA B-CONDENSED MATTER | 2015年 / 476卷
基金：
中国国家自然科学基金;
关键词：
Non-stoichiometric La-Fe-Co-Si alloys; Magnetic entropy change; Microstructure; METAMAGNETIC TRANSITION; ENTROPY CHANGE;
D O I：
10.1016/j.physb.2015.03.012
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The microstructure, phase constitution and magnetocaloric properties of non-stoichiometric La1.7Fe11Co0.8Si1.2 alloys were investigated. Compared with stoichiometric La(Fe,Co,Si)(13) alloys, a complex phase, including La(Fe,Co,Si)(13) phase, La5Si3 phase, La(Fe,Co)Si phase, alpha-Fe phase and La oxide, can rapidly form upon annealing at 1323 K for 24 h in the present alloy. The resulting alloy exhibits a large magnetic entropy change of 7.5 J kg(-1) K-1 at 271 K in a magnetic field change of 2 T. In addition, the annealed La1.7Fe11Co0.8Si1.2 alloy shows a reversible magnetic phase transition with zero hysteresis. These characteristics indicate that the present La-rich La-Fe-Co-Si compounds have potential for the applications as ambient magnetic refrigeration materials. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：167 / 170
页数：4
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