Influence of Tb substitution on low-field magnetocaloric effect in Gd5Si1.72Ge2.28 alloy

被引：1

作者：

Deng Jian-qiu ^{[1
]}

Zhuang Ying-hong ^{[2
]}

Wang Ri-chu ^{[1
]}

Yang Zhen ^{[1
]}

Xu Bin ^{[1
]}

机构：

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

[2] Guangxi Univ, Key Lab New Proc Technol Nonferrous Met & Mat, Minist Educ, Nanning 530004, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY | 2008年 / 15卷 / 04期

基金：

中国国家自然科学基金;

关键词：

rare earth alloy; magnetic entropy change; magnetic phase transition; magnetocaloric effect (MCE);

D O I：

10.1007/s11771-008-0080-1

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The lattice parameters, magnetic phase transition, Curie temperature and magnetocaloric properties for (Gd1-xTbx)(5)Si1.72Ge2.28 alloys with x = 0, 0.15, 0.20 and 0.25 were investigated by X-ray powder diffractometry and magnetization measurements. The results show that suitable partial substitution of Tb in Gd5Si1.72Ge2.28 compound remains the first-order magnetic-crystallographic transition and enhances the magnetic entropy change, although Tb substitution decreases the Curie temperature (T-C) of the compounds. The magnetic entropy change of (Gd1-xTbx)(5)Si1.72Ge2.28 alloys retains a large value in the low magnetic field of 1.0 T. The maximum magnetic entropy change for (Gd0.80Tb0.20)(5)Si1.72Ge2.28 alloy in the magnetic field from 0 to 1.0 T reaches 8.7 J/(kg center dot K), which is nearly 4 times as large as that of (Gd0.3Dy0.7)(5)Si-4 compound (|Delta S-max| = 2.24 J/(kg center dot K), T-C=198 K).

引用

页码：429 / 433

页数：5

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