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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Microstructural and electrical conductivity properties of cubic zirconia doped with various amount of titania

Tekeli S., Akcimen A., Gürdal O., Gürü M.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 25, nr 2

39-42

Purpose: A dopant concentration higher than the optimum may reduce the number of mobile oxygen ions because of defect association causing conductivity degredation. In this study, the effect of TiO2 addition on the microstructure and electrical conductivity of cubic zirconia was investigated. Design/methodology/approach: The cubic zirconia powders with 0-10 wt% TiO2 were prepared by a colloidal processing and pressureless sintering. The effect of TiO2 addition on the microstructure and electrical conductivity of cubic zirconia was investigated. Sintered specimens were characterized by XRD, SEM and impedance spectroscopy. Findings: The experimental results showed that when the Ti02 amount was less than 5 wt %, the specimens were entirely single cubic phase; further addition of TiO2 (5 wt% or more) destabilized cubic zirconia phase and caused the formation of tetragonal phase. Grain size measurements for undoped and TiO2 doped cubic zirconia specimens showed that grain size decreased with increasing TiO2 content. The electrical conductivity of TiO2 doped cubic zirconia decreased with increasing TiO2 content and increased with increasing test temperature. Research limitations/implications: The measurement of electrical conductivity is one of the important requirements for the electrolyte in solid oxide fuel cells. Generally, the ac impedance of an ionic conductor contains the contributions from grain, grain boundary and electrode-electrolyte interface at high, intermediate and low frequencies, respectively, which can be reflected in a complex plane by three successive arcs. Originality/value: Determination of the microstructural and electrical conductivity properties of cubic zirconia doped with various amount of titania.