YSZ-MgO composite electrolyte with adjusted thermal expansion coefficient to other SOFC components

Y. Shiratori, F. Tietz, H. P. Buchkremer, D. Stöver

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

YSZ-MgO composite electrolytes were prepared by mixing partially stabilized zirconia with various amounts of magnesium oxide and firing at 1400 °C for 5 h. From X-ray diffraction (XRD) and dilatometry it was observed that 15-20 mol% MgO was dissolved in the zirconia leading to composites composed of fully stabilized zirconia and magnesia. The thermal expansion increased with increasing MgO content and a thermal expansion coefficient (TEC) of 12.3 × 10-6 K-1 was obtained with 80 mol% MgO in the starting mixture. The thermal expansion fits very well with those of interconnect and electrode materials in a solid oxide fuel cell (SOFC) but the YSZ-MgO composite already contains high amounts of MgO, which percolatively inhibits the conductivity. Highest total conductivity at 800 °C of 0.015 S cm-1 was measured on a composite with 20 mol% MgO in the starting mixture which is similar to values of fully yttria-stabilized zirconia (YSZ).

Original languageEnglish
Pages (from-to)27-33
Number of pages7
JournalSolid State Ionics
Volume164
Issue number1-2
DOIs
Publication statusPublished - Oct 1 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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