Antisite disorder and phase segregation in Mn${}_2$NiSn

Abstract

A systematic study of crystal structure, local structure, magnetic and transport properties in quenched and temper annealed Ni${}_{2-x}$Mn${}_{1+x}$Sn alloys indicate the formation of Mn${}_3$Sn type structural defects caused by an antisite disorder between Mn and Sn occupying the Y and Z sublattices of X${}_2$YZ Heusler structure. The antisite disorder is caused by the substitution of Ni by Mn at the X sites. On temper annealing, these defects segregate and phase separate into $L{2}_1$ Heusler and $D{0}_{19}$ Mn${}_3$Sn type phases.

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