Transformation of fluorite δ-Bi2O3 into a new tetragonal phase
| Autor: | Zyryanov Vladimir V., Petrov Sergey A. |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of the Serbian Chemical Society, Vol 87, Iss 12, Pp 1367-1380 (2022) |
| Druh dokumentu: | article |
| ISSN: | 0352-5139 1820-7421 |
| DOI: | 10.2298/JSC220622075Z |
| Popis: | Bismuth oxide kinetically stabilized by doping with a metastable structure of disordered fluorite δ-Bi2O3 has a unique conductivity. Oxygen selective membranes at intermediate temperatures ~550ºC, on the base of cermet δ-Bi2O3/Ag, have the highest potential for air separation and can be used to produce oxygen for distributed multigeneration by burning fossil carbon fuels. When searching for the optimal composition of δ-Bi2O3, the degradation of fluorite into a new tetragonal phase was discovered in ceramics synthesized using mechanical activation. The tetragonal phase is formed and exists in a topotaxial composite with the fluorite structure. For a relatively stable over a wide temperature range tetragonal phase with a = 0.3854, c = 0.88905 nm, S.G. P-4, crystal structure and atomic coordinates have been proposed. In samples of fluorite and topotaxial composite, the Raman and Mössbauer spectra were recorded and discussed. The discovery of a new tetragonal phase of doped bismuth oxide and its existence area makes it possible to optimize the composition and the synthesis of a more stable solid electrolyte δ-Bi2O3 with high conductivity. |
| Databáze: | Directory of Open Access Journals |
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