Phase relations in oxygen-deficient SrCoO2.5−δ
| Autor: | M.V. Zinkevich, Yu. G. Zonov, V.V Vashook |
|---|---|
| Rok vydání: | 1999 |
| Předmět: |
Strontium
Phase transition Enthalpy Kinetics chemistry.chemical_element Thermodynamics General Chemistry Partial pressure Condensed Matter Physics Cobaltite chemistry.chemical_compound chemistry Electrical resistivity and conductivity Physical chemistry General Materials Science Entropy (order and disorder) |
| Zdroj: | Solid State Ionics. 116:129-138 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/s0167-2738(98)00270-7 |
| Popis: | Several different methods have been applied in order to investigate phase relations in the oxygen-deficient perovskite SrCoO2.5−δ with respect to temperature and oxygen partial pressure. Three different polymorphs of strontium cobaltite have been detected: the rhombohedral phase (δ≤0.16), the cubic pseudo-perovskite, probably existing in ordered microdomains (0.16≤δ≤0.21) and the disordered cubic perovskite (δ≥0.21). The standard thermodynamic functions (enthalpy and entropy) for the corresponding phase transitions have been calculated. The kinetics of transformation of cubic pseudo-perovskite→rhombohedral phase have been studied in air at different temperatures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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