Magnetic properties and magnetic entropy change of LaFe11.5Si1.5Hy interstitial compounds

被引：85

作者：

Chen, YF ^{[1
]}

Wang, F

Shen, BG

Hu, FX

Sun, JR

Wang, GJ

Cheng, ZH

机构：

[1] Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, POB 603, Beijing 100080, Peoples R China

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

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2003年 / 15卷 / 07期

关键词：

D O I：

10.1088/0953-8984/15/7/102

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

LaFe11.5Si1.5Hy interstitial compounds have been prepared by hydrogen absorption and subsequent desorption. The Curie temperatures are easily tunable for a wide temperature range from similar to195 to similar to340 K by hydrogen content. The maximal magnetic entropy changes, under a magnetic field change of 0-5 T, are as large as 16.8-20.5 J kg(-1) K-1, exceeding that of Gd (\DeltaS\ similar to 9.8 J kg(-1) K-1 at T-c = 293 K) by 70-110% in the vicinity of room temperature. The large magnetic entropy change of all hydrides may be attributed to the first-order itinerant-electron metamagnetic transition confirmed by the Arrott plots. Large \DeltaS\, convenient adjustment of T-c and small thermal and magnetic hystereses, make LaFe11.5Si1.5Hy interstitial hydrides promising candidates for magnetic refrigerants in the corresponding temperature range.

引用

页码：L161 / L167

页数：7

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