Abstract
ZrO2:10 mol%Sc2O3 (10ScSZ) powders were synthesized by the polyacrylamide technique (route I) and the polymeric precursor technique (route II). Attrition milling was used to break up powder agglomerates. The evolution of the distribution of particle size upon attrition milling was evaluated by laser scattering. Impedance spectroscopy measurements were carried out in cold-pressed powders in the 500oC-1400oC range during sintering and in the 300-500oC range after sintering. Upon sintering, the decrease of the total electrical resistivity of the specimens prepared with both powders is similar. Nanosize ZrO2:10 mol% Sc2O3 powders synthesized by route I are less sinteractive than powders synthesized by route II due to formation of agglomerates, which produce, upon sintering, pellets with intragranular pores. Sintered pellets using powders prepared by route I have lower electrical conductivity than pellets using powders prepared by route II.
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