Optical properties and local structure of LiGe2(PO4)3-based glasses and glass-ceramics: Effect of Al2O3 introduction and glass-to-crystal transition

Vlasov, M.I.; Tsymbarenko, D.M.; Pershina, S.V.; Weinstein, I.A.

Авторы: Vlasov M.I., Tsymbarenko D.M., Pershina S.V., Weinstein I.A.
Журнал: Ceramics International
Том: 51
Номер: 28
Год издания: 2025
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 58258
Последняя страница: 58264
DOI: 10.1016/j.ceramint.2025.10.045
Аннотация: LiGe2(PO4)3-based glass-ceramics are promising materials for electrolytes in all-solid-state lithium batteries. Typically, they are produced by direct glass crystallization, and subjected to a GeO2 partial substitution by Al2O3 to enhance the material conductivity properties. However, the glass-to-crystal transition, as well as optical properties and corresponding optical gap parameters have been poorly studied. Therefore, in our paper we focus on the impact of the Al2O3 introduction and stepwise crystallization on the optical properties and local structure of LiGe2(PO4)3-based materials. The pair distribution function analysis indicates that in the amorphous state these materials show GeO4 environment, and Al2O3 introduction does not promote any significant changes of their short-range order. During crystallization, which starts at ∼610 °C and completes at ∼670 °C, GeO4 transforms into GeO6, and for alumina-containing LiGe2(PO4)3 the GeOn polyhedral distortions are observed. Optical measurements revealed the presence of oxygen vacancies in the materials in amorphous state and their stepwise “healing” at a glass-to-crystal transition. This correlates well with the GeO4 to GeO6 transformation, for which extra oxygen is needed. Estimation of the optical gap Eg shows that both crystallization and Al2O3 introduction increase the gap, and for LiGe2(PO4)3-based glass-ceramics Eg is greater than 6.15 eV, indicating that the obtained materials are wide-gap dielectrics. The obtained results provide new insights into the properties of LiGe2(PO4)3-based glasses and glass-ceramics, which are useful for their functional utilization.
Добавил в систему: Цымбаренко Дмитрий Михайлович

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Optical properties and local structure of LiGe2(PO4)3-based glasses and glass-ceramics: Effect of Al2O3 introduction and glass-to-crystal transitionстатья Исследовательская статья

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