Oxygen non-stoichiometry and phase decomposition of double perovskite-like molybdates Sr2MMoO6-delta, where M = Mn, Co, and Ni
| Autor: | K.S. Tolstov, B.V. Politov, V.P. Zhukov, E.V. Chulkov, V.L. Kozhevnikov |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: | |
| Popis: | The thermodynamic stability borders and variations of oxygen non-stoichiometry in the perovskite-like molybdates Sr2MMoO6–δ, where M = Mn, Co, and Ni, are studied by using coulometric titration measurements. The data obtained are consistent with the reductive decomposition of Sr2NiMoO6–δ and Sr2CoMoO6–δ at small deviations of oxygen content 6–δ from its stoichiometric value. The manganite Sr2MnMoO6–δ exhibits considerably wider variations of δ at temperatures 1023 – 1223 K and oxygen pressures of 10–8 – 10–5 atm. The increase of the pressure results in Sr2MnMoO6–δ oxidative decomposition to SrMoO4 and Sr2Mn2O5 followed by oxidation of Sr2Mn2O5 to SrMnO3. The estimates based on density functional theory (DFT) are used to rationalize the results obtained. This work was carried out under support of government assignment for the ISSC UB RAS (theme № AAAA-A19-119031890026-6). DFT calculations were performed on the URAN cluster at the IMM UB RAS. |
| Databáze: | OpenAIRE |
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