【摘要】 通过往母合金Ni51·5Mn25Ga23·5掺入7种IVA,VA和VIA过渡族元素得到系列掺杂合金Ni51·5Mn23M2Ga23·5.M为掺杂元素.实验结果表明,掺杂效应一般引起马氏体相变温度的下降,其中,W的掺杂是7种元素中唯一使相变温度升高的特例,且出现了中间马氏体相变.同时,在价电子浓度不变的情况下,相变更敏感于原子的尺度效应.实验发现,Ti,Zr,Hf,V四种非磁性元素的掺杂使Mn原子磁矩减小,而Nb,Ta,W三种非磁性元素的掺杂却可以明显地增大Mn原子的磁矩.在考察掺杂效应时,不能忽略马氏体相变引起的晶格变化对材料磁性的影响.更多还原

【Abstract】 Ni 51.5 Mn 23 M₂Ga 23.5 materials are to reveal the dopant effect on the martensitic transition and the magnetic properties. We found that the dopants Ti, Zr, Hf, V, Nb, and Ta lower the martensitic transition temperature of the sample, but W increases it. The martensitic transition temperature is very sensitive to the atomic size when the valence electronic concentration keeps constant for the doping elements. The dopants Ti, Zr, Hf or V decrease the magnetic moment of Mn atom in the martensite at low temperature, while Nb, Ta or W enhance it. A corresponding variation of T_C of the materials is not observed , which indicates that the influence of the lattice change of martensitic transition on the magnetic properties should also be talken into account.更多还原