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| Home > Publications database > Role of local structural distortions in the variation of martensitic transformation temperature with $e/a$ ratio in Ni$_2$Mn$_{1+x}$Z$_{1−x}$ (Z = In, Sn or Sb) alloys |
| Home > Publications database > Role of local structural distortions in the variation of martensitic transformation temperature with $e/a$ ratio in Ni$_2$Mn$_{1+x}$Z$_{1−x}$ (Z = In, Sn or Sb) alloys |
| Journal Article | PUBDB-2025-00815 |
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2025
RSC Publ.
Cambridge
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Please use a persistent id in citations: doi:10.1039/D4CP04014G doi:10.3204/PUBDB-2025-00815
Abstract: Ni$_2$Mn$_{1+x}$Z$_{1−x}$ (Z = In, Sn or Sb) undergo martensitic transformation with transformation temperature (TM) scaling with the average valence electron per atom $(e/a)$ ratio. However, the rate of increase of TM depends on the type of Z atom, with the slope of TM vs. e/a curve increasing from Z = In to Z = Sb. Local structural distortions are believed to be the leading cause of martensitic transformation in these alloys. A careful study of the Ni and Mn local structures in several Ni$_2$Mn$_{1+x}$Z$_{1−x}$ alloys with varying e/a ratio and the same Z atom, with the same e/a ratio but different Z atoms and with the same T$_M$ but with different Z atoms and different e/a ratio, revealed that the difference between Ni–Mn and Ni–Z nearest neighbor distances decreases as the Z atom changes from In to Sb. This decrease in the local structural distortion accommodates a higher content of Mn until the L2$_1$ structure becomes unstable and the alloy undergoes a martensitic transformation.
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