Modification of microstructure and magneto-caloric effect of Gd5Si2Ge2 alloy

被引：0

作者：

Yue, M ^{[1
]}

Niu, PL ^{[1
]}

Zeng, H ^{[1
]}

Zhang, JX ^{[1
]}

机构：

[1] Beijing Univ Technol, Minist Educ, Key Lab Adv Funct Mat, Beijing 100022, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2006年 / 35卷 / 01期

关键词：

Gd5Si2Ge2; alloy; heat treatment; magneto-caloric effect; microstructure;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In present study, effect of heat treatment conditions on the microstructure and magneto-caloric effect of Gd5Si2Ge2 alloys prepared from high-purity distilled Gd was discussed. Microstructure and the chemical composition of the alloys were investigated by using scanning electron microscope (SEM) with energy dispersision X-ray spectroscopy (EDX). Magnetization behaviors of alloy from 250 K to 290 K in the magnetic field under 1.6X10(6) A/m were measured by means of vibrating sample magnetometer (VSM) and the maximum magnetic entropy was calculated according to the Maxwell equations. It is found that the microstructure of the alloys can be fully homogenized and the impurities in the alloys can be remarkably removed via appropriate heat treatment. As a result, the maximum magnetic entropy of the alloys increases by 200% while the magnetic ordering temperature slightly reduce about 10 K.

引用

页码：52 / 54

页数：3

共 5 条

[1] The giant magnetocaloric effect of optimally prepared Gd5Si2Ge2
Pecharsky, AO
Gschneidner, KA
Pecharsky, VK
[J]. JOURNAL OF APPLIED PHYSICS, 2003, 93 (08) : 4722 - 4728
[2] Giant magnetocaloric effect in Gd-5(Si2Ge2)
Pecharsky, VK
Gschneidner, KA
[J]. PHYSICAL REVIEW LETTERS, 1997, 78 (23) : 4494 - 4497
[3] Tunable magnetic regenerator alloys with a giant magnetocaloric effect for magnetic refrigeration from similar to 20 to similar to 290 K
Pecharsky, VK
Gschneidner, KA
[J]. APPLIED PHYSICS LETTERS, 1997, 70 (24) : 3299 - 3301
[4] PECHARSKY VK, 1997, J MAGN MAGN MATER, V167, P179
[5] Wu W, 2003, RARE METAL MAT ENG, V32, P962

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