Phase classification, electrical conductivity, and thermal stability of Bi2(V0.95TM0.05)O5.5 + δ (TM: Transition metal)

Yu Ki Taninouchi, Tetsuya Uda, Tetsu Ichitsubo, Yasuhiro Awakura, Eiichiro Matsubara

研究成果: ジャーナルへの寄稿学術誌査読

10 被引用数 (Scopus)

抄録

The electrical conductivity and phase transition temperatures of Bi 2(V0.95TM0.05)O5.5 + δ (TM (transition metal) = Ti, Zr, Hf, Nb, Ta, Cr, Mo, and W) were studied by X-ray diffraction analysis, AC impedance spectroscopy, and DC polarization measurements. To understand the changes in electrical conductivity, the structural phases were classified into three groups of αf, βf, and γf in terms of the network structures in the layer containing vanadium and oxygen. The phase transition behavior was substantially affected by TM doping. With the exception of Cr, TM doping decreased the βff transition temperature with respect to the undoped material. This was most significant in the case of Ta doping. The γf phase maintained a high oxide-ion conductivity of above 3 × 10- 1S cm- 1 at 700 °C. The conductivity of αf and the transition temperature between αf and βf exhibited a notable hysteresis upon heating and cooling. This phenomenon was prominent in Ti- and Nb-doped Bi 2VO5.5. TM doping also improved the long-term phase stability of γf against thermal decomposition into the BiVO4 and Bi3.5V1.2O8.25 phases at intermediate temperatures. Ti doping was the most effective method for suppressing thermal decomposition.

本文言語英語
ページ(範囲)1279-1286
ページ数8
ジャーナルSolid State Ionics
181
27-28
DOI
出版ステータス出版済み - 9月 6 2010
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 材料科学(全般)
  • 凝縮系物理学

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