Effect of double doping on crystal structure and electrical conductivity of CaO and WO3-doped Bi2O3

Cheng Yen Hsieh, Hao Sheng Wang, Kuan Zong Fung

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The atomic arrangement of WO3-doped Bi2O3 was found similar to that of the fluorite structure. However, the electrical conductivity of WO3-doped Bi2O3 is significantly lower than that of commonly used Y2O3-doped Bi2O3. The structure and electrical conductivity of samples formulated as (CaxW0.15Bi0.85-x)2O3.45-x (x=0, 0.1, 0.2 and 0.3) were investigated. The as-sintered (W0.15Bi0.85)2O3.45 and (Ca0.1W0.15Bi0.75)2O3.35 exhibit similar single tetragonal structure that is isostructural with 7Bi2O3·2WO3. Therefore, (W0.15Bi0.85)2O3.45 and (Ca0.1W0.15Bi0.75)2O3.35 formed a superstructure consisting of 10 enlarged cubic fluorite subcells. However, the as-sintered samples consist of a tetragonal structure and tetragonal CaWO4 for x=0.2 and 0.3 because the oxygen vacancy concentration increases. The conductivities of (CaxW0.15Bi0.85-x)2O3.45-x (x=0, 0.1, 0.2 and 0.3) did not exhibit linear dependence with x value. The best conductivity is 2.35×10-2Scm-1 at 700°C for x=0.1 that is higher than that of Ca-free (W0.15Bi0.85)2O3.45. The higher conductivity of (Ca0.1W0.15Bi0.75)2O3.35 than (W0.15Bi0.85)2O3.45 may result from the higher anion vacancy concentration and more symmetrical structure.

Original languageEnglish
Pages (from-to)3073-3079
Number of pages7
JournalJournal of the European Ceramic Society
Volume31
Issue number16
DOIs
Publication statusPublished - 2011 Dec 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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