Abstract
The change in the electrical resistivity of Y2O3-doped ZrO2 ceramics with microstructural modification was investigated. Two kinds of ZrO2 powder containing 8 mol.% Y2O3 (8Y) and 3 mol.% Y2O3 (3Y) were used as the raw powders. Six kinds of microstructure were designed: two single-phase specimens (8YS and 3YS) and four mixed-phase specimens (Par, Ser, GG and CC). Using an impedance analyser, the contributions of the structural components, i.e. Bulk and boundary, to the electrical resistivity were identified in air up to 750 degrees C. Microstructures that contained a large phase boundary area revealed a high electrical resistivity. In the low-temperature region, the grain boundaries and/or phase boundaries played important roles in the electrical resistivity while the contribution of the bulk component increased as the temperature increased.
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