The crystal structure of Rb2Ti2O5

Recent results have demonstrated an exceptionally high dielectric constant in the range 200 K-330 K in a crystalline tianium oxide : Rb2Ti2O5. In this article, the possibility of a structural transition giving rise to ferroelectricity is carefully inspected. In particular X-Ray diffraction, high res...

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Bibliographic Details
Published in:arXiv.org 2017-03
Main Authors: Federicci, R, Baptiste, B, Finocchi, F, Popa, A F, Brohan, L, Beneut, K, Giura, P, Rousse, G, Descamps-Mandine, A, Douillard, T, Shukla, A, Leridon, B
Format: Article
Language:English
Subjects:
Crystal structure
Ferroelectric materials
Ferroelectricity
Permittivity
Phase transitions
Raman spectroscopy
Transmission electron microscopy
X-ray diffraction
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Summary:Recent results have demonstrated an exceptionally high dielectric constant in the range 200 K-330 K in a crystalline tianium 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 DFT calculations. These important findings allow to discard the existence of a conventional ferroelectric phase transition as a possible mechanism for the unusual dielectric constant observed in this material.
ISSN:2331-8422