THE MANUFACTURING METHOD EFFECT ON THE STRUCTURE AND ELECTRICAL PROPERTIES OF SOLID SOLUTION Ce0.8Y0.2О2-?

Abstract

The solid solution Ce0.8Y0.2O2-? was obtained by three methods: sol gel, glycine nitrate and solid-state reaction. The synthesis temperature was 1350 ?C for the sample obtained by the sol gel method and 1500 ?C for the remaining samples. It’s shown by the X-Ray method that all samples have a cubic lattice with a fluorite structure. The microstructure, density, electrical conductivity, microhardness and crack resistance of the synthesized ceramics were investigated. By the impedance spectroscopy method, a system Ce0.8Y0.2O2-? obtained by the sol gel method was found to have the highest electrical conductivity reaching 5.37 mS/cm at a temperature of 550 ?С and the lowest activation energy equal to 0.83 eV in the temperature range of 300 – 550 ?C. The contribution to the conductivity of the grains and the grain boundaries is defined. A common conductivity is shown to be decreased because of the resistance of the grain boundaries for all samples.