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Tysonite-type solid solutions in the BiF3-BiOF-BaF2 system: Polymorphism and anionic conductivityстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 20 сентября 2013 г.
- Авторы: Prituzhalov V.A., Ardashnikova E.I., Dolgikh V.A., Abakumov A.M.
- Журнал: Russian Journal of Inorganic Chemistry
- Том: 56
- Номер: 3
- Год издания: 2011
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 313
- Последняя страница: 324
- DOI: 10.1134/S0036023611030168
- Аннотация: Tysonite solid solutions Bi1-x Ba (x) O (y) F3-x-2y in the BiF3-BiOF-BaF2 system were obtained by solid-phase synthesis in sealed copper tubes in an argon atmosphere at 873 K with subsequent quenching. The solid solutions were studied by X-ray diffraction, electron diffraction, and impedance spectroscopy. On the basis of X-ray powder diffraction data, the homogeneity ranges of the tysonite solid solutions were determined and the scheme of their location in the BiF3-BiOF-BaF2 system at 873 K was suggested. Aliovalent substitutions in both the cation and anion sublattices Ba2+ -> Bi3+ and O2- -> F- made it possible to vary the concentration of anion vacancies. It was found that, at a high concentration of anion defects at 873 K, the hexagonal tysonite modification with space group P6(3)/mmc is stable. With a decrease in the defect concentration, the trigonal tysonite modification with space group becomes stable. An ordered monoclinic tysonite-type modification BiO (y) F3 - 2y (0.13 < y < 0.23) was revealed. For the homogeneity ranges of all tysonite phases, dependences of the unit cell parameters and conductivity on the composition along the sections with a constant barium or oxygen content were reported. The most probable location of oxygen anions and anion vacancies in the tysonite structure is discussed.
- Добавил в систему: Долгих Валерий Афанасьевич