The Influence of Heat Treatment on the Phase Transformation Behavior and Magnetocaloric Effect of Gd₅Si₂Ge₂

Abstract:

In this thesis, a study was conducted on the magnetic phase transformation behavior and magnetocaloric effect (MCE) under a low magnetic field ranging from 0-1.5 T for the casted and annealed Gd₅Si₂Ge₂ alloys. The result shows that high-heat treatment significantly influences the structural and magnetocaloric properties of Gd₅Si₂Ge₂ alloy. High-heat treatment at 1573 K is beneficial to increasing Gd₅Si₂Ge₂-type monoclinic structure which benefits the first-order transition. The MCE of annealed Gd₅Si₂Ge₂ alloy drastically increases and the highest value of S_M~18.12 J/kg·K at 282 K upon H=1.5 T which is obviously larger than that of as-casted Gd₅Si₂Ge₂ ( S_M~5.03 kg·K at 276 K upon H=1.5 T). The giant magnetocaloric effect is obtained for Gd₅Si₂Ge₂ alloy by high-heat treatment.

• Periodical: Applied Mechanics and Materials (Volumes 448-453)
• Pages: 3514-3518
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.448-453.3514
• Online since: October 2013
• Authors: Xue Ling Hou, Chun Yu Liu, Hui Min Hu, Yun Xue, Hui Xu
• Keywords: Gd₅Si₂Ge₂Alloy, Heat Treatment, Magnetocaloric Effect, Phase Transformation Behavior

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