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Federicci, R., Baptiste, B., Finocchi, F., Popa, F., Brohan, L., Beneut, K., Giura, P., Rousse, G., Descamps-Mandine, A., Douillard, T., Shukla, A. & Leridon, B. (2017) The crystal structure of Rb2Ti2O5. Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials, 73 1142–1150.
Added by: Richard Baschera (2018-02-08 09:15:07) Last edited by: Richard Baschera (2018-02-08 09:17:45) |
| Type de référence: Article DOI: 10.1107/S2052520617013646 Clé BibTeX: Federicci2017a Voir tous les détails bibliographiques  |
Catégories: ID2M Créateurs: Baptiste, Beneut, Brohan, Descamps-Mandine, Douillard, Federicci, Finocchi, Giura, Leridon, Popa, Rousse, Shukla Collection: Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials |
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Recent results have demonstrated an exceptionally high permittivity in the range 200-330 K in crystalline titanium oxide Rb2Ti2O5. In this article, the possibility of a structural transition giving rise to ferroelectricity is carefully inspected. In particular, X-ray diffraction, high-resolution transmission electron microscopy and Raman spectroscopy are performed. The crystal structure is shown to remain invariant and centrosymmetric at all temperatures between 90 K and 450 K. The stability of the C2/m structure is confirmed by density functional theory calculations. These important findings allow the existence of a conventional ferroelectric phase transition to be ruled out as a possible mechanism for the colossal permittivity and polarization observed in this material.
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