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Bulk and grain boundary conductivities as function of temperature and oxygen partial pressure of scandia-stabilized zirconia co-doped with yttria and ceria

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Author(s)

W. Preis, A. Egger, J. Waldhäusl, W. Sitte, E. De Carvalho, J. T.S. Irvine

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Abstract

The electrical properties of bulk and grain boundaries of Ce xY0.2-xSc0.6Zr3.2O 8-δ (0 ≤ × ≤ 0.2) have been investigated as a function of temperature and oxygen partial pressure by application of impedance spectroscopy. All samples have been prepared by means of a sol-gel combustion process. The ionic conductivities of the bulk are in the range from 0.03 to 0.04 S cm-1 at 700°C in air. In the case of ceria-doped samples a significant decrease of the ionic conductivities of both bulk and grain boundary regions is observed under reducing conditions [p(O2) < 10 -15 bar, 700°C] which may be interpreted in terms of association or clustering of oxygen vacancies. In addition, ageing studies have been performed on scandia-stabilized zirconia, doped with 10 mol% Sc 2O3 and 1.0 mol% CeO2, in reducing atmosphere (1%-H2/Ar) at 700°C by application of a dc four-point technique according to van der Pauw and ac measurements.

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Details

Original languageEnglish
Title of host publicationECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI)
Pages1635-1642
Number of pages8
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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