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  Robust Bain distortion in the premartensite phase of a platinum-substituted Ni2MnGa magnetic shape memory alloy

Singh, S., Dutta, B., D'Souza, S. W., Zavareh, M. G., Devi, P., Gibbs, A. S., et al. (2017). Robust Bain distortion in the premartensite phase of a platinum-substituted Ni2MnGa magnetic shape memory alloy. Nature Communications, 8(1): 1006, pp. 1-10. doi:10.1038/s41467-017-00883-z.

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 Urheber:
Singh, Sanjay1, Autor           
Dutta, B.2, Autor
D'Souza, S. W.1, Autor           
Zavareh, M. G.1, Autor           
Devi, P.1, Autor           
Gibbs, A. S.2, Autor
Hickel, T.2, Autor
Chadov, S.3, Autor           
Felser, C.4, Autor           
Pandey, D.2, Autor
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863440              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Zusammenfassung: The premartensite phase of shape memory and magnetic shape memory alloys (MSMAs) is believed to be a precursor state of the martensite phase with preserved austenite phase symmetry. The thermodynamic stability of the premartensite phase and its relation to the martensitic phase is still an unresolved issue, even though it is critical to the understanding of the functional properties of MSMAs. We present here unambiguous evidence for macroscopic symmetry breaking leading to robust Bain distortion in the premartensite phase of 10% Pt-substituted Ni2MnGa. We show that the robust Bain-distorted premartensite (T2) phase results from another premartensite (T1) phase with preserved cubic-like symmetry through an isostructural phase transition. The T2 phase finally transforms to the martensite phase with additional Bain distortion on further cooling. Our results demonstrate that the premartensite phase should not be considered as a precursor state with the preserved symmetry of the cubic austenite phase.

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Sprache(n): eng - English
 Datum: 2017-10-232017-10-23
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1038/s41467-017-00883-z
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Titel: Nature Communications
  Kurztitel : Nat. Commun.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: London : Nature Publishing Group
Seiten: 1006 Band / Heft: 8 (1) Artikelnummer: 1006 Start- / Endseite: 1 - 10 Identifikator: ISSN: 2041-1723
CoNE: https://pure.mpg.de/cone/journals/resource/2041-1723