Oxygen diffusion and surface exchange studies on (La0.75Sr0.25)0.95Cr0.5Mn0.5O3−δ |
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| Affiliation: | 1. Department of Chemistry, Tamkang University, Tamsui 25137, Taiwan;2. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan;3. Institute of Nuclear Energy Research, Atomic Energy Council, Longtan 32546, Taiwan;1. Institute of High Temperature Electrochemistry, Ural''s Branch of Russian Academy of Science, 20 Academicheskaya st., Yekaterinburg, Russia;2. Ural federal University, 19 Mira st., Yekaterinburg, Russia |
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| Abstract: | Oxygen tracer diffusion coefficient (D⁎) and surface exchange coefficient (k⁎) have been measured for (La0.75Sr0.25)0.95Cr0.5Mn0.5O3−δ using isotopic exchange and depth profiling by secondary ion mass spectrometry technique as a function of temperature (700–1000 °C) in dry oxygen and in a water vapour-forming gas mixture. The typical values of D⁎ under oxidising and reducing conditions at ∼ 1000 °C are 4 × 10− 10 cm2 s− 1 and 3 × 10− 8 cm2 s− 1 respectively, whereas the values of k⁎ under oxidising and reducing conditions at ∼ 1000 °C are 5 × 10− 8 cm s− 1 and 4 × 10− 8 cm s− 1 respectively. The apparent activation energies for D⁎ in oxidising and reducing conditions are 0.8 eV and 1.9 eV respectively. |
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