Abstract
In the present work, the binary system of (Bi2O3)1−x(Yb2O3)x was investigated. For the production and stabilization of the fcc-type solid solution, small amounts of Yb2O3 were doped into pure α-Bi2O3 by the solid-state reactions in the doping range of 0.10 ≤ x ≤ 0.2. According to XRD and electrical conductivity measurements, the crystal formula of the formed δ-Bi2O3 was found to be Bi(III)4−2xYb(II)2xO6−x□2+x (□: oxygen ion vacancies, VO··) and x values were in the range of 0.14 ≤ x ≤ 0.20 for heat treatment at 750 °C. Four-probe d.c. electrical conductivity measurements showed that the studied system had an O2− ionic-type electrical conductivity behavior. The maximum levels of the electrical conductivity were observed for 16 mol δ-YSB material which had σ T values: 0.316 and 0.632 Ω−1 cm−1 at 700 and 750 °C, respectively. These materials can be used as ceramic electrolytes for solid electrolytic industrial applications.
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