Investigation of the Ionic Conductivities of Yttria-Doped Ceria and Yttria-Stabilized Zirconia by Using the Statistical Moment Method
| Autor: | Le Thu Lam, Vu Van Hung, Bui Duc Tinh |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Dopant Diffusion Anharmonicity General Physics and Astronomy Thermodynamics Ionic bonding 02 engineering and technology Activation energy 021001 nanoscience & nanotechnology 01 natural sciences Condensed Matter::Materials Science Lattice constant Vacancy defect 0103 physical sciences Physics::Atomic and Molecular Clusters Physics::Chemical Physics 0210 nano-technology Yttria-stabilized zirconia |
| Zdroj: | Journal of the Korean Physical Society. 75:293-303 |
| ISSN: | 1976-8524 0374-4884 |
| Popis: | The ionic conductivities of yttria-doped ceria (YDC) and yttria-stabilized zirconia (YSZ), are investigatied using statistical moment method including the anharmonicity effects of thermal lattice vibrations. The expressions for the lattice constant and the vacancy activation energy are derived in closed analytic forms in terms of the power moments of the atomic displacements. The distribution of oxygen vacancies around dopants and the important role of cation barriers on vacancy diffusion are evaluated in detail. The lattice constants, activation energies, ionic conductivities of YDC and YSZ are calculated as functions of the dopant concentration. Notably, the ionic conductivities depend linearly on dopant concentration. Our results are in good agreement with those of both previous experiments and several theoretical calculations. |
| Databáze: | OpenAIRE |
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