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

页码：167 / 170

页数：4

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