Oxygen ionic transport in Bi2O3-based oxides: II. The Bi2O3–ZrO2–Y2O3 and Bi2O3–Nb2O5–Ho2O3 solid solutions
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- Yaremchenko, A., Kharton, V., Naumovich, E. et al. J Solid State Electrochem (1998) 2: 308. doi:10.1007/s100080050105
Electrical conductivity, fluorite-type cubic unit cell volume and thermal expansion of the (Bi1−xNbx)1−y HoyO1.5+δ (x=0.05 and 0.08; y=0.10−0.15) and (Bi1−xZrx)1−yYyO1.5+δ (x=0.05 and 0.07; y=0.15) solid solutions have been found to decrease regularly with increasing dopant content. Annealing at temperatures below 900 K leads to a phase decomposition and to a sharp decrease in conductivity of the ceramics. Oxygen ion transference numbers have been determined by the e.m.f. method and by Faradaic efficiency measurement to exceed 0.9. A new technique of studying Faradaic efficiency has been proposed and verified using (Bi0.95Zr0.05)0.85Y0.15O1.5+δ and Zr0.90Y0.10O1.95 ceramic samples.