MnCo1-xAlxGe化合物的磁热效应Magnetocaloric effect in MnCo1-xAlxGe compounds

J. Mater. Sci. Technol. ›› 2009, Vol. 25 ›› Issue (06): 781-784.

MnCo1-xAlxGe化合物的磁热效应Magnetocaloric effect in MnCo1-xAlxGe compounds

张伟光¹;特古斯²;吴永丽³;伊日勒图³;闫换英³;松林²

1. 内蒙古师范大学内蒙古自治区功能材料物理与化学重点实验室
2. 内蒙古师范大学
3.

收稿日期:2008-12-17 修回日期:2009-06-09 出版日期:2009-11-28 发布日期:2009-11-24
通讯作者: 特古斯
基金资助:
国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金;国家自然科学基金

Magnetocaloric Effect in MnCo_1-xAl_xGe Compounds

Weiguang Zhang, O. Tegus, Yongli Wu, Yirgeltu, Huanying Yan ,Song Lin

Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials, Inner Mongolia Normal University, Huhhot 010022, China

Received:2008-12-17 Revised:2009-06-09 Online:2009-11-28 Published:2009-11-24
Contact: O. Tegus
Supported by:
National Natural Foundation of China (No. 50661004),
the Scientific Program of Inner Mongolia Normal University, China (No. 2007002)

摘要/Abstract

摘要：

通过XRD和磁性测量对MnCo1-xAlxGe (x = 0.00, 0.03, 0.05, 0.08, 0.10, 0.13, 0.15,0.20)化合物的磁热效应进行了研究。 XRD分析表明，MnCo1-xAlxGe系列化合物在Al的含量x ≤ 0.03时，样品为正交结构；当Al的含量x > 0.03时，样品为六角结构。随Co/Al的改变，居里温度可以控制在286K～ 347K范围内变化。在低磁场(0-1.5T )下, Mn Co1-xAlxGe 系列合金具有的最大等温磁熵变为1.52 J/kgK。

关键词: 过渡金属化合物, 磁熵变, 磁制冷

Abstract:

The effects of substitution of Al for Co on magnetic and magnetocaloric properties of MnCo_1-xAl_xGe (x=0.00, 0.03, 0.05, 0.08, 0.10, 0.13, 0.15, and 0.20) compounds have been investigated by X-ray diffraction (XRD) and magnetization measurements. XRD exhibits that MnCo_1-xAlxGe compounds crystallize in the orthorhombic TiNiSi-type structure for x≤0.03 and in the hexagonal Ni₂In-type crystal structure for x>0.03. Magnetic measurements show that the Curie temperature can be tuned between 286 and 347 K by changing the Co/Al ratio. The maximum magnetic entropy change determined from the isothermal magnetization measurement by Maxwell relation reaches 1.52 J/(kgK) for x=0.08 in a field change from 0 to 1.5 T around 310 K.

Key words: Transition metal compounds, Magnetic entropy change, Magnetic refrigeration

张伟光特古斯吴永丽伊日勒图闫换英松林. MnCo1-xAlxGe化合物的磁热效应Magnetocaloric effect in MnCo1-xAlxGe compounds[J]. J. Mater. Sci. Technol., 2009, 25(06): 781-784.

Weiguang Zhang,O. Tegus,Yongli Wu,Yirgeltu,Huanying Yan,Song Lin. Magnetocaloric Effect in MnCo_1-xAl_xGe Compounds[J]. J Mater Sci Technol, 2009, 25(06): 781-784.

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