Thermodynamic properties of nonstoichiometric oxygen in manganite Ca0.9Pr0.1MnO3–δ
- Авторлар: Leonidov I.1, Konstantinova E.1, Patrakeev M.1, Kozhevnikov V.1
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Мекемелер:
- Institute of Solid State Chemistry
- Шығарылым: Том 90, № 11 (2016)
- Беттер: 2123-2128
- Бөлім: Chemical Thermodynamics and Thermochemistry
- URL: https://journals.rcsi.science/0036-0244/article/view/168912
- DOI: https://doi.org/10.1134/S0036024416110133
- ID: 168912
Дәйексөз келтіру
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.
Авторлар туралы
I. Leonidov
Institute of Solid State Chemistry
Хат алмасуға жауапты Автор.
Email: leonidov@imp.uran.ru
Ресей, Yekaterinburg
E. Konstantinova
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
Ресей, Yekaterinburg
M. Patrakeev
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
Ресей, Yekaterinburg
V. Kozhevnikov
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
Ресей, Yekaterinburg