Actas de congresos
Electrical measurements in doped zirconia-ceria ceramics
Fecha
2002-01-01Registro en:
Materials For Electrochemical Energy Conversion and Storage. Westerville: Amer Ceramic Soc, v. 127, p. 137-146, 2002.
1042-1122
10.1002/9781118370858.ch15
WOS:000181620900015
1922357184842767
0000-0003-1300-4978
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
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.