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Spectral properties and temperature-dependence of semiconductivity of various doped bismuth trioxide polycrystals

“…It has been reported that the v-form has a deficient fluorite structure, with two vacant oxygen sites in a unit cell [5][6][7][8], and shows a high oxygen ion conductivity, which is more than one order of magnitude higher than that of stabilized zirconia. Whereas the monoclinic form displays low electronic conductivity [9], the pure fl-form has been reported to exhibit an ionic and electronic mixed conduction, where the electronic conduction is predominant below a partial oxygen pressure PO 2 of 10 Pa [10]. The frequency dispersion of impedance reported by Harving and General [9] also suggests ionic conduction in the pure fl-form in air.…”