Abstract
The total conductivity (σT) in the β-phase and δ-Bi2O3 doped with Tb4O7 system was measured in the composition range between 1 and 30 mol% Tb4O7 at different temperatures. According to the DTA/TG results, this tetragonal type solid solution was stable up to about ∼740°C, and the solubility limit was found at ∼5 mol% Tb4O7 in the β-phase; this fcc type solid solution was stable up to about ∼740°C, and the solubility limit was found at ∼30 mol% Tb4O7 in the δ-phase. All phases showed predominant oxide ionic conduction. It has been proposed that β- and δ-Bi2O3 phases contain a large number of oxide anion vacancies and incorporated terbium cations at tetrahedral sites that affect the oxygen sublattice of the crystal structure.
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