Foschini, C. R.Perazolli, L.Souza, DPF2014-05-202014-05-202002-01-01Materials For Electrochemical Energy Conversion and Storage. Westerville: Amer Ceramic Soc, v. 127, p. 137-146, 2002.1042-1122http://hdl.handle.net/11449/35205Zirconia-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.137-146engTrabalho apresentado em evento10.1002/9781118370858.ch15WOS:000181620900015Acesso aberto19223571848427670000-0003-1300-4978