Thermodynamic properties of nonstoichiometric oxygen in manganite Ca0.9Pr0.1MnO3–δ
- 作者: Leonidov I.1, Konstantinova E.1, Patrakeev M.1, Kozhevnikov V.1
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隶属关系:
- Institute of Solid State Chemistry
- 期: 卷 90, 编号 11 (2016)
- 页面: 2123-2128
- 栏目: 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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详细
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.
作者简介
I. Leonidov
Institute of Solid State Chemistry
编辑信件的主要联系方式.
Email: leonidov@imp.uran.ru
俄罗斯联邦, Yekaterinburg
E. Konstantinova
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
俄罗斯联邦, Yekaterinburg
M. Patrakeev
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
俄罗斯联邦, Yekaterinburg
V. Kozhevnikov
Institute of Solid State Chemistry
Email: leonidov@imp.uran.ru
俄罗斯联邦, Yekaterinburg