Magnetocaloric Effect in MnCo1-xAlxGe Compounds

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

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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)

Abstract

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

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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Magnetocaloric Effect in MnCo_1-xAl_xGe Compounds

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