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Investigation of electrical and mechanical properties of tetragonal/cubic composite electrolytes prepared by impregnation of 8YSZ with zirconia solution

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

DOI

Author(s)

M. Ghatee, M. M. Shariat, J. T.S. Irvine

School/Research organisations

Abstract

Zirconia solid electrolytes with nonequilibrium composite structure were prepared by impregnation of a porous 8YSZ matrix with a solution of Zirconia. Microstructures were characterized by XRD and SEM. The electrical properties were studied by impedance spectroscopy as a function of temperature. Biaxial flexural strength and fracture toughness of composite samples were measured by ring on ring and Vickers microhardness indentation methods respectively. The microstructures of the composite electrolytes were composed of cubic grains surrounded by tetragonal second phase grains. It was shown that the electrical and mechanical properties of the prepared electrolyte can be adjusted by controlling the amount of doped zirconia. Increasing the amount of doped zirconia increases the tetragonal phase content which improves fracture toughness and fracture strength. In addition, increasing tetragonal phase content of the composite electrolytes decreases the conductivity at high temperatures while the situation is reversed at low temperatures.

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Original languageEnglish
Title of host publicationECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI)
Pages1541-1550
Number of pages10
Volume25
Edition2 PART 2
DOIs
Publication statusPublished - 1 Dec 2009
Event11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting - Vienna, Austria
Duration: 4 Oct 20099 Oct 2009

Conference

Conference11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting
CountryAustria
CityVienna
Period4/10/099/10/09

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