Novel microstructure and large magnetocaloric effect in La2Fe11Si2 magnetic refrigerant

被引：16

作者：

Zhang, Mingxiao ^{[1
,2
]}

Liu, Jian ^{[1
,2
]}

He, Chun ^{[1
,2
]}

Yan, Aru ^{[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

来源：

MATERIALS LETTERS | 2014年 / 134卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Magnetic materials; Magnetocaloric; Microstructure; Magnetic entropy change; Hysteresis; ENTROPY CHANGE; METAMAGNETIC TRANSITION; PHASE; COMPOUND;

D O I：

10.1016/j.matlet.2014.07.060

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A study of the microstructure and magnetocaloric effect in bulk La2Fe11Si2, as an off-stoichiometric NaZn13-type La(Fe,Si)(13) composition, was carried out. The microstructure and phase constitution strongly rely upon heat treatment processing, especially on annealing temperature. Upon annealing at 1423 K, a unique morphology containing granular-like La(Fe,Si)(13) grains with a high fraction of similar to 80 vol. %, surrounded by Cr5B3-type La5Si3 phase was observed. A large entropy change of 14.5 J/kg K in 2 T was achieved in this bulk sample after annealing for a relatively short time (e.g. 24 h). In addition, the bulk sample also exhibits pronounced first-order magnetic transition behavior with zero thermal and magnetic hysteresis. The syntheses of bulk La2Fe11Si2 alloy with good magnetocaloric performance by simplified preparation process are encouraging for future development of LaFe-based magnetocaloric alloys as a magnetic refrigerant for magnetic cooling system applications. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：87 / 90

页数：4

共 18 条

[1] The effect of magnetic irreversibility on estimating the magnetocaloric effect from magnetization measurements [J].