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Composition and temperature dependence of the crystal structure of Ni–Mn–Ga alloys

The crystal structure of ferromagnetic near-stoichiometric Ni2MnGa alloys with different compositions has been studied at ambient temperature. The studied alloys, with five-layered (5M) and seven-layered (7M) martensitic phases, exhibit the martensitic transformation temperature (TM) up to 353 K. Al...

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Bibliographic Details
Published in:Journal of applied physics 2004-06, Vol.95 (12), p.8074-8078
Main Authors: Lanska, N., Söderberg, O., Sozinov, A., Ge, Y., Ullakko, K., Lindroos, V. K.
Format: Article
Language:English
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Summary:The crystal structure of ferromagnetic near-stoichiometric Ni2MnGa alloys with different compositions has been studied at ambient temperature. The studied alloys, with five-layered (5M) and seven-layered (7M) martensitic phases, exhibit the martensitic transformation temperature (TM) up to 353 K. Alloys with these crystal structures are the best candidates for magnetic-field-induced strain applications. The range of the average number of valence electrons per atom (e/a) was determined for phases 5M, 7M, and nonmodulated martensite. Furthermore, a correlation between the martensitic crystal structure, TM and e/a has been established. The lattice parameters ratio (c/a) as a function of e/a or TM has been obtained at ambient temperature for all martensitic phases. That the paramagnetic-ferromagnetic transition influences the structural phase transformation in the Ni–Mn–Ga system has been confirmed.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1748860