Magnetic and structural transition of Ni_50+xMn_25−x/2Ga_25−x/2 (x=2–5) alloys

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• 作者：Feng ; Gen ; Jiang ; Chengbao ; Liang ; Ting ; Xu ; Huibin
• 关键词：75.30.Kz ; 75.80.+q ; 81.30.Kf ; NiMnGa ; Magnetic transition ; Phase transition ; Ni substitution ; Magnetic shape memory alloy
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2002
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：July, 2002
• 卷：248
• 期：2
• 页码：312-317
• 文件大小：190 K

摘要

Magnetic and structural transitions of non-stoichiometric Ni_50+xMn_25−x/2Ga_25−x/2 (x=2–5) alloys are systematically investigated. Differential scanning calorimetry and modified thermogravimetry (TG) are used to measure magnetic and structural transitions simultaneously. The structural transition temperatures increase monotonically with increasing Ni substitution for Mn and Ga. Different magnetic transition sequences on heating were observed from ferromagnetic martensite to ferromagnetic autensite, then to paramagnetic autensite, from ferromagnetic martensite to paramagnetic austensite or from ferromagnetic martensite to paramagnetic martensite, respectively. Three kinds of NiMnGa alloys were obtained according to the sequence of the structural and magnetic transition, whose structural transition temperatures are lower, equal to or higher than the magnetic transition temperatures.