Improvement in the magnetocaloric properties of sintered La(Fe,Si)13 based composites processed by La-Co grain boundary diffusion

被引：22
|
作者：
Zhong, X. C. [1 ,4 ]
Peng, D. R. [1 ]
Dong, X. T. [1 ]
Huang, J. H. [2 ]
Zhang, H. [1 ,3 ]
Jiao, D. L. [1 ]
Zhang, H. [1 ,3 ]
Liu, Z. W. [1 ]
Ramanujan, R. V. [4 ,5 ]
机构：
[1] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China
[2] Baotou Res Inst Rare Earths, Baotou 014030, Peoples R China
[3] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[4] Nanyang Technol Univ, Sch Mat Sci & Engn, Singapore 639798, Singapore
[5] Singapore HUJ Alliance Res & Enterprise SHARE, Nanomat Energy & Energy Water Nexus NEW, Campus Res Excellence & Technol Enterprise CREATE, Singapore 138602, Singapore
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 780卷
基金：
中国国家自然科学基金;
关键词：
Magnetocaloric effect; Hot pressing; Grain boundary diffusion; LaFe11.6Si1.4/La-Co composites; MAGNETIC REFRIGERATION; NAZN13-TYPE PHASE; ENTROPY CHANGE; PARTICLE-SIZE; TEMPERATURE; MICROSTRUCTURE; LA(FE; TRANSITION; ALLOYS;
D O I：
10.1016/j.jallcom.2018.11.395
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：
A novel method to combine hot pressing and grain boundary diffusion in order to fabricate La(Fe,Si)(13) based magnetocaloric composites is described. LaFe11.6Si14/La-Co magnetocaloric composites were prepared by hot-pressing, followed by diffusion annealing heat treatment. The Curie temperature (T-C) of these composites increases from 197 K to similar to 235 K due to the diffusion of Co into the NaZn13-type (1:13) majority phase. The maximum magnetic entropy change (-Delta S-M)(max) at 2 T first increases with increasing diffusion time from 5.62 to 7.60 J/(kg.K) and followed by a further increase up to 9.15 J/(kg.K) due to the recombination of the 1:13 phase. The Co content of the La-Co binder could be used to tune the formation of the desired 1:13 phase. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：873 / 880
页数：8
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