Physical and electrical properties of yttria stabilised zirconia prepared from nanosized powders

摘要

Nanosized powders of ZrO₂-10 mol-%Y₂O₃ were prepared by a wet chemical process, with the main purpose of verifying changes in the physical properties of powders, and to study their influence on the electrical resistivity of the sintered ceramic. Optimisation of some parameters involved in the synthesis process resulted in a powder with high specific surface area (> 150 m2 g-1) and with monomodal pore size distribution. The rate of shrinkage was a maximum at 1040°C and high density was obtained on optimising the firing schedule. Impedance spectroscopy results show that the intragrain resistivity was approximately equal to that of a single crystal of the same chemical composition.