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Article Dans Une Revue Acta Crystallographica Section B : Structural Science, Crystal Engineering and Materials [2014-...] Année : 2017

Crystallographic and optical study of LiNb1 − xTaxO3

Résumé

Powders of lithium niobate-tantalate across the full compositional range have been made and crystals grown using a lithium vanadate flux growth technique. The Li-content of a lithium tantalate crystal has been determined using the zero-birefringence temperature and Curie measurements, confirming the Li content is between that of congruent and stoichiometric crystals. X-ray diffraction measurements show the Nb/Ta displacement and octahedral tilt both decrease as the Ta content is increased. This also results in a decrease in the lattice parameters from lithium niobate to lithium tantalate. Birefringence measurements on the crystals as a function of temperature have been used to determine the point that the crystals become zero-birefringent, and by comparison with the structural studies have confirmed that it is not related to a phase transition and the structures remain polar through the zero-birefringence points.

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Autre

Dates et versions

hal-02392690 , version 1 (04-12-2019)

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Citer

Steven Huband, D Keeble, A Glazer, Ausrine Bartasyte, P Thomas. Crystallographic and optical study of LiNb1 − xTaxO3. Acta Crystallographica Section B : Structural Science, Crystal Engineering and Materials [2014-..], 2017, 73 (3), pp.498 - 506. ⟨10.1107/S2052520617004711⟩. ⟨hal-02392690⟩
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