ISSN:
1572-8838
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Electrical Engineering, Measurement and Control Technology
Notes:
Abstract The ionic conduction in sintered Bi2O2-Y2O3 was investigated by measuring the conductivity and the emf of an oxygen concentration cell using the specimen tablet as electrolyte. The face centred cubic phase in this system was found to show high oxide ion conduction accompanied by a little electronic conduction when exposed to air. This phase was stable with a composition of 25 ∼ 43 mol % Y2O3 over a wide range of temperatures, and the oxide ion conductivity increased with decrease in Y2O3. The conductivities of (Bi2O3)0.75 (Y2O3)0.25 were 1.6×10−1 Ω−1 cm−1 at 700°C and 1.2×10−2 Ω−1 cm−1 at 500°C values which are many times higher than those of stabilized zirconia (ZrO2)0.90(Y2O3)0.10 at corresponding temperatures. Specimens containing less than 25 mol % Y2O3 showed a phase transition at 700 ∼ 580°C and the conductivities decreased remarkably below these temperatures. High oxide ion conduction in the fcc phase is attributed to the migration of oxide ion vacancies which were present in an appreciable amount.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01637268
