Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK)

Changsha,China,10.16-10.18,2010

ISBN: 978-1-935068-41-9 Scientific Research Publishing, USA

E-Book 2313pp Pub. Date: October 2010

Category: Chemistry & Materials Science

Price: $360

Title: Influence of Heat Treatment on the Structure and Magnetic Properties of Gd5Sn4 Alloy
Source: Proceedings of the 7th National Conference on Functional Materials and Applications (FMA 2010 E-BOOK) (pp 1430-1434)
Author(s): Xi-chun Zhong, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Hu Zhang, The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011-3020, USA
M. Zou, The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011-3020, USA
Q. Cao, The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011-3020, USA
Zhong-wu Liu, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
De-chang Zeng, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Hong-ya Yu, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
Wan-qi Qiu, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.
K.A. Gschneidner jr, The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011-3020, USA
V.K. Pecharsky, The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011-3020, USA
Abstract: The Gd5Sn4 alloy was prepared by argon arc melting followed by homogenization annealing. By means of X-ray diffraction pattern and SQUID magnetometer, the effects of heat treatment on the structure and magnetic properties of Gd5Sn4 alloy were investigated. The results sho that, the uniformity of the Gd5Sn4 alloy was improved greatly after annealing at 1300℃ for 2h, and the Gd5Sn4 major phase increased from 85.39% in as-cast to 98.47% (molar percentage ratio) in annealed sample. The Curie temperature Tc of Gd5Sn4 alloy decreases from ~82K for as-cast sample to ~80K for annealed sample. It was also found that the homogenization heat treatment has relatively large influence on the magneticaloric effect. The maximum magnetic entropy change(-ΔSM)max in a low field of ΔH=20 kOe increases from 21.5 J/kg?K to 24.65 J/kg?K after heat treatment.
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