2007/08/20 by P. A. Bhobe, P A Bhobe, K. R. Priolkar +3 · 1 citation
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Shape Memory Alloy Transformations #Thermal Expansion and Ionic Conductivity #cond-mat.mtrl-sci
paper · pdf · doi:10.1088/0953-8984/20/01/015219
20 pages, 9 figures
arxiv created 2007/08/20 · openalex publication_date 2007/12/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Extended x-ray absorption fine-structure (EXAFS) measurements have been carried out on Ni50Mn35Sn15 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 TM ∼ 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.