Hydrogenating process and magnetocaloric effect in La_0.7Pr_0.3Fe_11.5Si_1.5C_0.2H_x hydrides

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• 作者：J.L. Zhao^a ; ^b ; J. Shen^c ; H. Zhang^a ; Z.Y. Xu^a ; J.F. Wu^c ; F.X. Hu^a ; J.R. Sun^a ; B.G. Shen^a ; ^{shenbg@aphy.iphy.ac.cn} ; ^{shenbg@g203.iphy.ac.cn}
• 关键词：Magnetocaloric effect ; Magnetic entropy change ; Magnetic hysteresis loss
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 April, 2012
• 卷：520
• 期：Complete
• 页码：277-280
• 文件大小：402 K

摘要

Interstitial La_0.7Pr_0.3Fe_11.5Si_1.5C_0.2H_x hydrides with large magnetocaloric effect are prepared. It is found that the addition of carbon atoms can lower the rate of hydrogen absorption/release, which is beneficial to an accurate control of hydrogen content. The Curie temperature T_C can be adjusted to the room temperature by changing the carbon/hydrogen content. The introduction of carbon atoms leads to a remarkable reduction of thermal/magnetic hysteresis because the first-order magnetic transition is weakened. The maximal magnetic entropy change of La_0.7Pr_0.3Fe_11.5Si_1.5C_0.2H_1.2 is found to be 22.1 J/kg K at T_C = 321 K without hysteresis loss for a field change of 0-5 T.