Electrical measurements in doped zirconia-ceria ceramics
Nenhuma Miniatura disponível
Data
2002-01-01
Autores
Foschini, C. R.
Perazolli, L.
Souza, DPF
Título da Revista
ISSN da Revista
Título de Volume
Editor
Amer Ceramic Soc
Resumo
Zirconia-ceria powders with 12 mol % of CeO2 doped with 0.3 mol% of iron, copper, manganese and nickel oxides were synthesized by the conventional mixed oxide method. These systems were investigated with regard to the sinterability and electrical properties. Sintering was studied considering the shrinkage rate, densification, grain size, and phase evolution. Small amount of dopant such as iron reduces sintering temperature by over 150degreesC and more than 98% of tetragonal phase was retained at room temperature in samples sintered at 1450degreesC against 1600degreesC to stabilize the tetragonal phase on pure ZrO2-CeO2 system. The electrical conductivity was measured using impedance spectroscopy and the results were reported. The activation energy values calculated from the Arrhenius's plots in the temperature range of 350-700degreesC for intragrain conductivities are 1.04 eV.
Descrição
Palavras-chave
Como citar
Materials For Electrochemical Energy Conversion and Storage. Westerville: Amer Ceramic Soc, v. 127, p. 137-146, 2002.