%0 Journal Article
%A Manea, Nafea
%A Welter, Edmund
%A Priolkar, Kaustubh
%T Role of local structural distortions in the variation of martensitic transformation temperature with e/a ratio in Ni<sub>2</sub>Mn<sub>1+x</sub>Z<sub>1−x</sub> (Z = In, Sn or Sb) alloys
%J Physical chemistry, chemical physics
%V 27
%N 5
%@ 1463-9076
%C Cambridge
%I RSC Publ.
%M PUBDB-2025-00815
%P 2528 - 2535
%D 2025
%X Ni<sub>2</sub>Mn<sub>1+x</sub>Z<sub>1−x</sub> (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<sub>2</sub>Mn<sub>1+x</sub>Z<sub>1−x</sub> 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<sub>M</sub> 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<sub>1</sub> structure becomes unstable and the alloy undergoes a martensitic transformation.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 39804236
%U <Go to ISI:>//WOS:001395292400001
%R 10.1039/D4CP04014G
%U https://bib-pubdb1.desy.de/record/624346