Effect of y2O3 addition on crystal structure and electrical conductivity of WO3 Doped Bi2O3 solid electrolyte

Cheng Yen Hsieh, Kuan-Zong Fung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

WO3-doped Bi2O3 was found to exhibit stable fluorite-based structure. However, the electrical conductivity of WO 3-doped Bi2O3 is significantly lower than that of Y2O3-doped Bi2O3. The structure and electrical conductivity of samples formulated as (YXW 0.15Bi0.85-X)2O3.45 (X=0.1∼0.4) were investigated. The assintered (Y0.1W0.15Bi 0.75)2O3.45 exhibited a single cubic structure that is isostructural with δ-Bi2O3. However, the cubic fluorite structure may decompose into cubic structure and rhombohedral Y6WO12 after heat-treatment at 900°C for 3 hours. For X=0 2, 0.3 and 0.4, the as-sintered samples consisted of a cubic fluorite structure and rhombohedral Y6WO12. The conductivities of (YXW0.15Bi0.85-X)2O3.45 45 (X=0.1-0.4) decrease with increasing X value. For X=0.1, the conductivity is 1.97 × 10-3 S cm-1 at 700°C and slightly lower than that of (W0.15Bi0.85)2O3.45. The Bi 6s2 lone pairs of electrons are known to lead to enough oxygen ion mobility. Thus it is reasonable to expect that ionic conductivity drops as Y substitutes for Bi.

Original languageEnglish
Title of host publicationECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X
Pages2357-2362
Number of pages6
Edition1 PART 2
DOIs
Publication statusPublished - 2007 Dec 1
Event10th International Symposium on Solid Oxide Fuel Cells, SOFC-X - , Japan
Duration: 2007 Jun 32007 Jun 8

Publication series

NameECS Transactions
Number1 PART 2
Volume7
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other10th International Symposium on Solid Oxide Fuel Cells, SOFC-X
CountryJapan
Period07-06-0307-06-08

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Hsieh, C. Y., & Fung, K-Z. (2007). Effect of y2O3 addition on crystal structure and electrical conductivity of WO3 Doped Bi2O3 solid electrolyte. In ECS Transactions - 10th International Symposium on Solid Oxide Fuel Cells, SOFC-X (1 PART 2 ed., pp. 2357-2362). (ECS Transactions; Vol. 7, No. 1 PART 2). https://doi.org/10.1149/1.2729356