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Synthesis and Study on Ionic Conductive (Bi1-x,Vx)O1.5-δ Materials with a Dual-Phase Microstructure.
Materials 2016 October 26
Homogeneous Bi₂O₃-V₂O₅ powder mixtures with different amounts of V₂O₅ content (≤15 mol%) were prepared by colloidal dispersion and sintering to high density. The sintered and annealed samples were studied by thermal analysis, quantitative X-ray diffraction and scanning electron microscopy. The electrical and ionic conductivities of the conductors were also measured by a four-probe direct current (DC) method. The results of the samples prepared at 600-800 °C and annealed for as long as 100 h show that the sintered samples consisting of a pure γ phase or δ + γ binary phase perform differently in conductivity. The highly conductive δ phase in the composition of Bi0.92V0.08O1.5-δ enhances the electric conductivity 10-times better than that of the pure γ-sample (Bi0.94V0.06O1.5-δ) between 400 and 600 °C. The compatible regions of the γ phase with the α- or δ phase are also reported and discussed, so a part of the previously published Bi₂O₃-V₂O₅ phase diagram below 800 °C is revised.
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