Effect of site occupancy disorder on Martensitic properties of Mn$_{2}$NiIn type alloys: x-ray absorption fine structure study

D. N. Lobo; K. R. Priolkar; A. Koide; S. Emura

doi:10.1063/1.4975403

paper

Effect of site occupancy disorder on Martensitic properties of Mn $_{2}$ NiIn type alloys: x-ray absorption fine structure study

arXiv:1701.08561 · doi:10.1063/1.4975403

Abstract

We have carried out \textit{ab-initio} calculations of local structure of Mn and Ni in Mn $_{2}$ Ni $_{1.5}$ In $_{0.5}$ alloy with different site occupancies in order to understand the similarities in martensitic and magnetic properties of Mn $_{2}$ Ni $_{1 + x}$ In $_{1 - x}$ and Ni $_{2}$ Mn $_{1 + x}$ In $_{1 - x}$ alloys. Our results show that in Mn $_{2}$ Ni $_{1 + x}$ In $_{1 - x}$ alloys there is a strong possibility of Mn atoms occupying all the three, X, Y and Z sites of X $_{2}$ YZ Heusler structure while Ni atoms preferentially occupy the X sites. Such a site occupancy disorder of Mn atoms is in addition to a local structural disorder due to size differences between Mn and In atoms which is also present in Ni $_{2}$ Mn $_{1 + x}$ In $_{1 - x}$ alloys. Further, a comparison of the calculations with experimental XAFS at the Mn and Ni K edges in Mn $_{2 - y}$ Ni $_{1.6 + y}$ In $_{0.4}$ ( $- 0.08 \leq y \leq 0.08$ ) indicate a strong connection between martensitic transformation and occupancy of Z sites by Mn atoms.

Effect of site occupancy disorder on Martensitic properties of Mn2​NiIn type alloys: x-ray absorption fine structure study

Abstract

References in corpus (12)

Effect of site occupancy disorder on Martensitic properties of Mn $_{2}$ NiIn type alloys: x-ray absorption fine structure study