Very large magnetic entropy change near room temperature in LaFe11.2Co0.7Si1.1

被引：253

作者：

Hu, FX ^{[1
]}

Shen, BG

Sun, JR

Wang, GJ

Cheng, ZH

机构：

[1] Chinese Acad Sci, State Key Lab Magnetism, Inst Phys, Beijing 100080, Peoples R China

[2] Chinese Acad Sci, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2002年 / 80卷 / 05期

关键词：

Magnetism - Sodium compounds - Silicon compounds - Cobalt compounds - Lanthanum compounds - Zinc compounds - Iron compounds;

D O I：

10.1063/1.1447592

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A very large magnetic entropy change DeltaS has been observed in Fe-based cubic NaZn13-type compound LaFe11.2Co0.7Si1.1 near the Curie temperature T-C of 274 K. The value of the entropy change is similar to20.3 J/kg K under a magnetic field of 5 T at T-C=274 K. It markedly exceeds that of pure Gd at the corresponding temperature range [V. K. Pecharsky & K. A. Gschneidner, Jr., Phys. Rev. Lett. 78, 4494 (1999)]. The great entropy change produced by the sharp change of magnetization is associated with a large negative lattice expansion at T-C. The very large magnetic entropy change and low cost suggest that the compound LaFe11.2Co0.7Si1.1 has great potential for applications as magnetic refrigerants near room temperature. (C) 2002 American Institute of Physics.

引用

页码：826 / 828

页数：3

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