A systematic investigation of the structure and local structure of Ni_2−xMn_1+xGa alloys 0 ≤ x ≤ 1 reveals antisite disorder to be a possible reason for higher martensitic transformation temperature of Mn₂NiGa as compared to Ni₂MnGa. The antisite disorder between the Y and Z sublattices of the X₂YZ Heusler structure results in segregation of Mn₃Ga type defect phase and a Ni-rich Heulser phase with a higher e/a ratio. This Ni-rich Heusler phase appears to be responsible for the higher martensitic transformation temperature of the Mn₂NiGa type Heusler alloys.

中文翻译：

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反位无序在 Ni2−xMn1+xGa 的马氏体转变中的作用

_{对 Ni 2− x} Mn _{1+ x} Ga 合金 0 ≤  x ≤ 1的结构和局部结构的系统研究表明，与 Ni ₂ MnGa相比，反位无序是 Mn ₂ NiGa 的马氏体转变温度更高的可能原因。_{X 2} YZ Heusler结构的Y和Z亚晶格之间的反位无序导致Mn ₃ Ga型缺陷相和具有较高e/a比的富Ni Heulser相偏析。这种富含镍的 Heusler 相似乎是 Mn ₂ NiGa 型 Heusler 合金较高的马氏体转变温度的原因。