Factors influencing the Martensitic interactions in Ni50Mn35Sn15: An EXAFS study

Abstract

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.

arXiv comment20 pages, 9 figures

References in corpus (5)

• Inverse magnetocaloric effect in ferromagnetic Ni-Mn-Sn alloys
• Shape memory ferromagnets
• Giant entropy change at the co-occurrence of structural and magnetic transitions in the Ni2.19Mn0.81Ga Heusler alloy
• Anomalous vibrational effects in non-magnetic and magnetic Heusler alloys
• Local Atomic Structure of Martensitic Ni${}_{2+x}$Mn${}_{1-x}$Ga: An EXAFS Study

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• Local atomic arrangement and martensitic transformation in Ni${}_{50}$Mn${}_{35}$In${}_{15}$: An EXAFS Study
• Determination of the vibrational contribution to the entropy change at the martensitic transformation in Ni-Mn-Sn metamagnetic shape memory alloys: A combined approach of time-of-flight neutron spectroscopy and ab-initio calculations
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• Lattice strain accommodation and absence of pre-transition phases in Ni${}_{50}$Mn${}_{25+x}$In${}_{25-x}$
• Driving force for martensitic transformation in Ni${}_2$Mn${}_{1+x}$Sn${}_{1-x}$