Phase Stability of Bi-2(V1-xMEx)O5.5+delta (ME = Li and Ag, x=0.05 and 0.1)

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The phase transition of high oxide-ion conductor Bi2(V1 xMEx)O5:5þ (ME ¼ Li and Ag, x ¼ 0:05 and 0.1) and its long-term phase stability against thermal decomposition have been studied. The transition behavior was determined by differential scanning calorimetry (DSC) as well as high-temperature X-ray diffraction (HT-XRD) analysis. The observed thermal and structural changes during temperature scans reveal the temperature dependence of electrical conductivity. Li- and Ag-doping do not sufficiently suppress thermal decomposition at intermediate temperatures between 400 and 600 C. In particular, partial decomposition was detected in Bi2(V0:9Ag0:1)O5:3 during a temperature scan by HT-XRD analysis, which explains the distinct change in electrical conductivity. We have generated pseudo-binary phase diagrams for Bi2(V1 xMEx)O5:5þ based on the X-ray diffraction analysis of powders annealed for 200 h and differential thermal analysis. The thermodynamically stable region of Bi2(V1 xMEx)O5:5þ is not sufficiently expanded by Li- and Ag-doping. At around 500 C, Bi2(V1 xMEx)O5:5þ is metastable, although it shows the highest oxide-ion conductivity among solid oxides.

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詳細情報 詳細情報について

  • CRID
    1050282810700273152
  • NII書誌ID
    AA1151294X
  • ISSN
    13459678
  • HANDLE
    2433/148407
  • 本文言語コード
    en
  • 資料種別
    journal article
  • データソース種別
    • IRDB

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