Zeng Hong, Yue Ming, Niu Peili , Zhang Jiuxing (Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology, Beijing 100022, China)
<正> The magneto-caloric effect of Gd5Si2Ge2 compounds produced by various techniques is investigated in terms of their magnetization behaviors in the magnetic field from 0 to 2.0 T. The studied materials include arc-melted, annealed and sintered alloys. The results demonstrate that the Gd5Si2Ge2 alloys obtained under different processing conditions possess distinct magneto-caloric effect due to their various microstructures. Proper annealing treatment can enhance the magneto-caloric effect of the alloy remarkably. While the sintered alloy bears relatively lower value of magnetic entropy change ( △SM) than arc-melted one. The magnetic entropy change of the annealed Gd5Si2Ge2 alloy arrives the maximum value of - △SM = 15.29 J ·kg-1 ·K-1 for magnetic field change under 2.0 T in the present work.
magneto-caloric effect; processing conditions; Gd5Si2Ge2; magnetic entropy change
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