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Open AccessArticle

Synthesis and Study on Ionic Conductive (Bi1−x,Vx)O1.5−δ Materials with a Dual-Phase Microstructure

Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan
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Academic Editor: Christof Schneider
Materials 2016, 9(11), 863; https://doi.org/10.3390/ma9110863
Received: 22 June 2016 / Revised: 3 October 2016 / Accepted: 11 October 2016 / Published: 25 October 2016
(This article belongs to the Section Energy Materials)
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. View Full-Text
Keywords: solid oxide fuel cell (SOFC); conductor; bismuth oxide; vanadium oxide; electrical conductivity solid oxide fuel cell (SOFC); conductor; bismuth oxide; vanadium oxide; electrical conductivity
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Lai, Y.-W.; Wei, W.-C.J. Synthesis and Study on Ionic Conductive (Bi1−x,Vx)O1.5−δ Materials with a Dual-Phase Microstructure. Materials 2016, 9, 863.

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