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YSZ–MgO composite electrolyte with adjusted thermal expansion coefficient to other SOFC components by Y. Shiratori; F. Tietz; H.P. Buchkremer; D. Stöver is a Materials Science article available to read on EtoBox.

What is YSZ–MgO composite electrolyte with adjusted thermal expansion coefficient to other SOFC components about?

YSZ -MgO composite electrolytes were prepared by mixing partially stabilized zirconia with various amounts of magnesium oxide and firing at 1400 jC 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 Â 10 À 6 K À 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 jC of 0.015 S cm À 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).

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Author

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

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-2738)

Published

2003

Language

EN

Field

Materials Science (Physical Sciences)