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High-temperature equilibrium between YBa2Cu3-xCoxO6+δ solid solutions and oxygen |
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| Authors: | M V Patrakeev E B Mitberg A A Lakhtin I A Leonidov V L Kozhevnikov V I Voronin |
| Affiliation: | (1) Institute of Solid-State Chemistry, Ural Division, Russian Academy of Sciences, Pervomaiskaya ul. 91, 620219 Yekaterinburg, Russia;(2) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, 620219 Yekaterinburg, Russia |
| Abstract: | The equilibrium oxygen content of YBa2Cu3-xCoxO6+δ (0.2 ≤x ≤ 0.8) solid solutions was determined by coulometric titration at temperatures in the range 600–850°C and oxygen pressures 1 ≤po 2 ≤ 105 Pa. The partial enthalpy and entropy of oxygen dissolution were evaluated as a function of composition. The thermodynamic functions were found to change sharply near the high- and low-oxygen limits of the solid solution. The results are interpreted in terms of a quasi-chemical model considering three inequivalent oxygen sites in the basal plane. |
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