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Thermochemical and Structural Properties of K2–2xNa2xFe1.5Nb0.5(PO4)3 (0 ≤ x ≤ 1) Solid Solutions with NASICON and Langbeinite Structuresстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 23 января 2026 г.
- Авторы: Koryttseva A.K., Knyazev A.V., Syrov E.V., Fukina D.G., Bazhenova I.A., Cheverikin V.V., Kuzovchikov S.V.
- Журнал: Russian Journal of Physical Chemistry A
- Том: 99
- Номер: 9
- Год издания: 2025
- Издательство: Pleiades Publishing, Ltd
- Местоположение издательства: Road Town, United Kingdom
- Первая страница: 1985
- Последняя страница: 1998
- DOI: 10.1134/s0036024425701432
- Аннотация: Abstract: The KNa2xFe1.5Nb0.5(PO4)3 (0 ≤ x ≤ 1) solid solutions were studied to find the boundaries of existence of the NASICON and langbeinite structural types and to determine the mixing energetics. The objects of study can find use as cathodes for Na-ion batteries. The powder samples were obtained by the solid-phase method and characterized by X-ray spectral microanalysis, X-ray diffraction, and differential scanning calorimetry. The structure was refined by the Rietveld method using X-ray powder diffraction data at room temperature. The phases that are isostructural to the mineral langbeinite (K2Mg2(SO4)3, sp. gr. P213) crystallize in the range of 0 ≤ x ≤ 0.4, while the phases isostructural to NASICON NaZr2(PO4)3 (sp. gr. R3-c) crystallize in the range of 0.9 ≤ x ≤ 1. The standard enthalpies of formation were determined by high-temperature drop-solution calorimetry in molten sodium molybdate solvent (3Na2O⋅4MoO3) at 800°C using an isoperibolic differential calorimeter of the Tian–Calvet type. The behavior of the obtained energy characteristics is discussed in accordance with the structural evolutions in the given range of solid solution compositions. This study expands the knowledge about the isomorphism of alkali cations in framework structures, showing the ways of possible changes in the properties in the given series.
- Добавил в систему: Чеверикин Владимир Викторович
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