Magnetostructural transition and adiabatic temperature change in Mn-Co-Ge magnetic refrigerants

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• 作者：J. Liu^a ; ^{j.liu@ifw-dresden.de} ; K. Skokov^a ; O. Gutfleisch^a ; ^b
• 关键词：Mn&ndash ; Co&ndash ; Ge ; Magnetocaloric effect ; Adiabatic temperature change ; Magnetostructural transition
• 刊名：Scripta Materialia
• 出版年：2012
• 期刊代码：157_13596462
• 类别：et
• 出版时间：May, 2012
• 卷：66
• 期：9
• 页码：642-645
• 文件大小：568 K

摘要

Crystal structure, structural and magnetic transitions were investigated in a series of MnCo_0.95Ge_x (x = 0.95, 0.97, 1.0) alloys. A first-order magnetic transition was observed in MnCo_0.95Ge_0.97 with a large thermal and magnetic hysteresis, while the other two composition alloys undergo a second-order ferromagnetic transition. The adiabatic temperature change for MnCo_0.95Ge_0.97 strongly relies on the sample history (heating or cooling protocols) due to the competition of structural and magnetic transitions. The structural contribution works against the magnetic contribution to the total magnetocaloric effect.