Thermodynamic properties of nonstoichiometric oxygen in manganite Ca0.9Pr0.1MnO3–δ
- Авторы: Leonidov I.1, Konstantinova E.1, Patrakeev M.1, Kozhevnikov V.1
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Учреждения:
- Institute of Solid State Chemistry
- Выпуск: Том 90, № 11 (2016)
- Страницы: 2123-2128
- Раздел: Chemical Thermodynamics and Thermochemistry
- URL: https://journals.rcsi.science/0036-0244/article/view/168912
- DOI: https://doi.org/10.1134/S0036024416110133
- ID: 168912
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Аннотация
The chemical potential of oxygen ΔμO relative to its standard state in the gas phase was calculated from the experimental dependences of the oxygen content in various polymorphic modifications of Ca0.9Pr0.1MnO3–δ on the partial pressure and temperature. The partial molar enthalpy \(\Delta {\overline H _O}\) and entropy \(\Delta {\overline S _O}\) of oxygen were obtained from the linear temperature dependences of ΔμO. Based on the ideal solution approximation, \(\Delta {\overline H _O}\) and \(\Delta {\overline S _O}\) were correlated with the enthalpies and entropies of the defect formation reactions, the concentrations of manganese cations, and the oxygen nonstoichiometry. The thermal excitation of Mn4+ cations was shown to substantially affect the thermodynamic functions of oxygen.
Об авторах
I. Leonidov
Institute of Solid State Chemistry
Автор, ответственный за переписку.
Email: leonidov@imp.uran.ru
Россия, Yekaterinburg
E. Konstantinova
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
Россия, Yekaterinburg
M. Patrakeev
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
Россия, Yekaterinburg
V. Kozhevnikov
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
Россия, Yekaterinburg