Lattice strain accommodation and absence of pre-transition phases in Ni50Mn25+xIn25−x

Lattice strain accommodation and absence of pre-transition phases in Ni50Mn25+xIn25−x

The stoichiometric Ni50Mn25In25 Heusler alloy transforms from a stable ferromagnetic austenitic ground state to an incommensurate modulated martensitic ground state with a progressive replacement of In with Mn without any pre-transition phases. The absence of pre-transition phases like strain glass...

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Veröffentlicht in:Journal of physics. Condensed matter 2020-12, Vol.32 (50)
Hauptverfasser: Nevgi, R, Priolkar, K R, Righi, L, Solzi, M, Cugini, F, Dias, E T, Nigam, A K
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magnetic properties
magnetic shape memory alloys
XAFS
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container_title Journal of physics. Condensed matter
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creator Nevgi, R
Priolkar, K R
Righi, L
Solzi, M
Cugini, F
Dias, E T
Nigam, A K
description The stoichiometric Ni50Mn25In25 Heusler alloy transforms from a stable ferromagnetic austenitic ground state to an incommensurate modulated martensitic ground state with a progressive replacement of In with Mn without any pre-transition phases. The absence of pre-transition phases like strain glass in Ni50Mn25+xIn25−x alloys is explained to be the ability of the ferromagnetic cubic structure to accommodate the lattice strain caused by atomic size differences of In and Mn atoms. Beyond the critical value of x = 8.75, the alloys undergo martensitic transformation despite the formation of ferromagnetic and antiferromagnetic clusters and the appearance of a super spin glass state.
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subjects magnetic properties
magnetic shape memory alloys
XAFS
title Lattice strain accommodation and absence of pre-transition phases in Ni50Mn25+xIn25−x
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