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HomeMaterials Science ForumMaterials Science Forum Vol. 685Effect of Small Amount of Zn Additions on the...

Effect of Small Amount of Zn Additions on the Magnetocaloric Properties of Gd₅Si₂Ge₂Alloy

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Abstract:

The structural and magnetic property of Gd₅Si_1.99Ge₂Zn_0.01and Gd₅Si₂Ge₂ alloys prepared by arc-melting the starting materials with commercial available purity (99.95wt%) was investigated by x-ray diffraction and Vibrating Sample Magnetometer. The result shows that the Gd₅Si_1.99Ge₂Zn_0.01alloy has monoclinic phase with Gd₅Si₂Ge₂-type structure. The polymorphic orthorhombic phase with Gd₅Si₄-type structure coexists with the monoclinic phase in Gd₅Si₂Ge₂alloy. The addition of small Zn element in Gd₅Si₂Ge₂alloy results in a considerable enhancement of its magnetocaloric effect. The maximum magnetic entropy change rapidly increases from 5.03J/(kg K) to 20.70J/(kg K) for a magnetic field change from 0 to 1.5T. The magnetic order temperature is 278K in Gd₅Si_1.99Ge₂Zn_0.01alloy and 278.5K in Gd₅Si₂Ge₂ alloy respectively. The magnetocaloric effect of Gd₅Si₂Ge₂ with the small addition of Zn is significantly improved.

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Periodical:

Materials Science Forum (Volume 685)

Pages:

307-310

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.685.307

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Online since:

June 2011

Authors:

Xue Zhen Wang, Jie Xiang, Zhi Zeng, Xing Hao Hu, Xue Ling Hou, Hui Xu

Keywords:

Gd₅Si₂Ge₂, Magnetocaloric Effect, Zn-Dopping

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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