The crystal structure of Rb2Ti2O5

Abstract : Recent results have demonstrated an exceptionally high dielectric constant in the range 200 K-330 K in a crystalline tianium oxide : Rb 2 Ti 2 O 5. 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 C 2/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.
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Rémi Federicci, Benoit Baptiste, Fabio Finocchi, Florin Popa, Luc Brohan, et al.. The crystal structure of Rb2Ti2O5. Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials, International Union of Crystallography, 2017, 73 (6), pp.1142-1150. ⟨10.1107/S2052520617013646⟩. ⟨hal-01985276⟩

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