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Proton conductivity of fluorite based rare earth titanates (LnxTi1–x)4O8–2x (Ln = Yb, Er, Ho, 0.667≤x≤0.765)статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Gorshkov Nikolay, Baldin Egor, Stolbov Dmitry, Vorobieva Galina, Shatov Alexander, Shlyakhtina Anna
- Журнал: Dalton Transactions
- Том: 53
- Номер: 35
- Год издания: 2024
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 14752
- Последняя страница: 14766
- DOI: 10.1039/d4dt01493f
- Аннотация: Solid solutions of rare earth titanates with high contents of rare earth oxides of up to 50–62% have beensynthesized by the co-precipitation method and their structure, microstructure and conductivity in dryand wet air have been studied. Proton conductors have been found for the first time in solid solutions ofrare earth titanates with a high content of Ln2O3 (>50%) with a nominal formula composition of(LnxTi1−x)4O8−2x (Ln = Yb, Er, Ho, 0.667 ≤ x ≤ 0.765). Among (LnxTi1−x)4O8−2x (Ln = Yb, Er, Ho, x = 0.684),(HoxTi1−x)4O8−2x (x = 0.684) showed the maximum conductivity in wet air. In this context, four additionalcompositions (HoxTi1−x)4O8−2x (х = 0.718, 0.734, 0.75, and 0.765) were synthesized in the holmium series.An increase in the holmium content leads to an increase in the proton transfer coefficients; at the sametime, a more complex nature of the dependence of the conductivity under dry and wet atmospheres isobserved. For the fluorite-like solid solution (HoxTi1−x)4O8−2x (0.701 ≤ x ≤ 0.765), the proton transfercoefficients were found to be ∼0.9 in the range of 200–450 °C. As the temperature continues to rise, theproton conductivity decreases quite sharply and the transfer coefficient becomes as low as 0.3 at 700 °C.The increase in proton conductivity in the Yb–Er–Ho series is associated with an increase in the hydrophilic properties of rare earth cations. In the (HoxTi1−x)4O8−2x (x = 0.667 ≤ x ≤ 0.765) series, the conductivity in wet air was ∼1 × 10−6 S cm−1 at 450 °C for most compositions. The conductivity of ceramics withx = 0.701 and 0.75 is about 2 times higher, which may be due to the optimal size of pyrochlore nanodomains in the fluorite matrix for x = 0.701 and the formation of pure fluorite for x = 0.75, respectivel
- Добавил в систему: Столбов Дмитрий Николаевич
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