Oxygen isotope exchange in doped lanthanum zirconates
| Autor: | Ivan I. Leonidov, Nikita A. Shevyrev, Andrei S. Farlenkov, E.S. Tropin, V.A. Eremin, A.V. Fetisov, A. V. Khodimchuk, Maxim V. Ananyev |
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| Rok vydání: | 2018 |
| Předmět: |
Diffusion
Doping Inorganic chemistry Pyrochlore chemistry.chemical_element 02 engineering and technology engineering.material Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Oxygen Isotopes of oxygen 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry X-ray photoelectron spectroscopy Materials Chemistry Ceramics and Composites engineering Lanthanum Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Journal of Solid State Chemistry. 268:45-54 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2018.08.022 |
| Popis: | The interaction between oxygen in the gas phase and La2–xCaxZr2O7–α (x = 0; 0.05; 0.1) with a pyrochlore structure was studied by the isotope exchange method with the gas phase equilibration in the temperature range of 600–900 °C and the oxygen pressure of 1.01 kPa. The oxygen diffusion and oxygen surface exchange coefficients were calculated for the investigated oxides. The rate-determining stage of the oxygen surface exchange kinetics for La1.9Ca0.1Zr2O7–α was found to be different from that for La1.95Ca0.05Zr2O7–α and La2Zr2O7–α. The influence of the calcium content in La2–xCaxZr2O7–α (x = 0; 0.05; 0.1) oxides on the heterogeneous exchange rates and oxygen tracer diffusion coefficients were discussed. |
| Databáze: | OpenAIRE |
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