影响Ni50Mn35Sn15中马氏体相互作用的因素：EXAFS研究
Factors influencing the Martensitic interactions in Ni50Mn35Sn15: An EXAFS study
摘要：
用扩展X射线吸收精细结构（EXAFS）方法研究了Ni $_{50}$ Mn $_{35}$ Sn $_{15}$在奥氏体和马氏体中的相变。与结构和磁相变的温度从磁化测量获得。该体系在319 K以下发生铁磁有序，而在T_PDMATHABMP $\sim$ 200 K发生结构相变. EXAFS测量已在Mn和Ni的K-边缘和相关的变化相对于这些吸收原子的局部结构进行了比较。最近邻相互作用的显着变化被视为系统过渡到低温马氏体相。EXAFS提供的证据，即使在立方相，是没有看到从X射线衍射研究的局部结构畸变。所获得的结果被理解在变化的组成原子之间的杂交，影响在费米能级的电子结构，与马氏体相变。
英文摘要：
Extended x-ray absorption fine-structure (EXAFS) measurements have been carried out on Ni$_{50}$Mn$_{35}$Sn$_{15}$ in the austenitic and martensitic phase. The temperatures associated with structural and magnetic phase transformations are obtained from magnetization measurements. The system orders ferromagnetically below 319 K while the structural phase transition occurs at T$_M$ $\sim$ 200 K. EXAFS measurements have been carried out at Mn and Ni K-edges and changes associated with respect to the local structure of these absorbing atoms are compared. Significant changes in the nearest neighbour interactions are seen as the system transits to the low temperature martensitic phase. EXAFS provides evidence for local structural distortion even in the cubic phase that is not seen from the x-ray diffraction studies. The results obtained are understood in terms of changing hybridization between the constituent atoms that influence the electronic structure at the Fermi level, associated with the austenitic-to-martensitic transition.
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