Magneto-Caloric Effect of Gd5Si2Ge2Compounds under Different Processing Conditions
来源期刊：JOURNAL OF RARE EARTHS2004年增刊第1期
论文作者：Zeng Hong Zhang Jiuxing Niu Peili Yue Ming
Key words：magneto-caloric effect; processing conditions; Gd5Si2Ge2; magnetic entropy change;
Abstract: The magneto-caloric effect of Gd5 Si2Ge2 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 Gd5 Si2Ge2 alloy arrives the 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.
Zeng Hong1，Zhang Jiuxing1，Niu Peili1，Yue Ming1
(1.Key Laboratory of Advanced Functional Materials, Ministry of Education, Beijing University of Technology,Beijing 100022, China)
Abstract:The magneto-caloric effect of Gd5 Si2Ge2 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 Gd5 Si2Ge2 alloy arrives the 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.
Key words:magneto-caloric effect; processing conditions; Gd5Si2Ge2; magnetic entropy change;
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