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.
Original language | English |
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Title of host publication | ECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI) |
Pages | 1635-1642 |
Number of pages | 8 |
Volume | 25 |
Edition | 2 PART 2 |
DOIs | |
Publication status | Published - 1 Dec 2009 |
Event | 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting - Vienna, Austria Duration: 4 Oct 2009 → 9 Oct 2009 |
Conference
Conference | 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting |
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Country/Territory | Austria |
City | Vienna |
Period | 4/10/09 → 9/10/09 |