In order to clarify the diffusion of oxide-ion vacancies in this perovskite-type oxide, the tracer diffusion coefficient of oxide ions in La1-xSrxCoO3 (x = 0.1) single crystals (table 83) was found by using an 18O/16O tracer gas-phase analysis method. The correlation factor for a vacancy diffusion mechanism in a perovskite-type anion sub-lattice was calculated to be 0.69. Using this value and the non-stoichiometric data, the diffusion coefficient of the oxide ion vacancies was estimated (table 84). The diffusivity of oxide ions in the perovskite-type oxide was comparable to that in fluorite-type oxides.
T.Ishigaki, S.Yamauchi, K.Kishio, J.Mizusaki, K.Fueki: Journal of Solid State Chemistry, 1988, 73[1], 179-87
Table 83
Tracer Diffusion of Oxide Ions in La0.9Sr0.1CoO3
(Oxygen partial pressure = 4.5kPa)
Temperature (C) | D (cm2/s) |
1000 | 2.05 x 10-8 |
950 | 7.60 x 10-9 |
900 | 2.61 x 10-9 |
850 | 8.99 x 10-10 |
Table 84
Diffusion Coefficient of Oxide Ion Vacancies in La0.9Sr0.1CoO3
(Oxygen partial pressure = 4.5kPa)
Temperature (C) | D (cm2/s) |
1000 | 9.76 x 10-6 |
950 | 7.56 x 10-6 |
900 | 5.55 x 10-6 |
850 | 4.28 x 10-6 |