Structural, Magnetic, and Magnetocaloric Studies of Ni₅₀Mn₃₀Sn₂₀ Shape Memory Alloy

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• 作者：Ramesh Chandra Bhatt ; R. S. Meena ; H. Kishan…
• 关键词：X ; ray diffraction ; Magnetic measurements ; Magnetocaloric ; Spin glasses
• 刊名：Journal of Superconductivity and Novel Magnetism
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：29
• 期：12
• 页码：3201-3206
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1557-1947
• 卷排序：29

文摘

We have synthesized a nominal composition of Ni₅₀Mn₃₀Sn₂₀ alloy using arc melting technique. Rietveld refinement confirms the austenite L2₁ structure in the Fm-3m space group. Electrical resistivity has been found to be clearly exhibiting two different phenomena viz a magnetic transition from paramagnetic to ferromagnetic and a structural transition from austenite to martensite phase. Thermo-magnetization measurements M(T) confirms ferromagnetic transition temperature T_C at 222 K and martensitic transition starting at 127 K (M_S). Magnetization measurement M(H) at 10 K confirms the ferromagnetic state. Frequency dependence of AC susceptibility χ’ at low temperature suggests spin glass behavior in the system. The isothermal magnetic entropy change values have been found to be 1.14, 2.69, and 3.9 J/Kg.K, with refrigeration capacities of 19.6, 37.8, and 54.6 J/Kg for the field change of 1, 2, and 3 T respectively at 227 K.