Electrical Behavior of Ceria-Stabilized Zirconia with Rare-Earth Oxide Additives

[[abstract]]The electrical properties of rare-earth oxide doped CeO2-ZrO2 ceramics are evaluated by impedance spectroscopy. Doping of the trivalent metal oxide decreases both the grain and grain-boundary resistivities of the CeO2-ZrO2 system. The grain and grain-boundary resistivities as well as the activation energy for conduction increase with the dopant cation radius. The grain conductivity is fairly constant for 2 mol% YO1.5-10 mol% CeO2-88 mol% ZrO2 samples sintered under different conditions, while lower grain-boundary resistivity is obtained for samples sintered at higher temperature for longer times. Possible mechanisms for the electrical behavior of the rare-earth oxide doped CeO2-ZrO2 ceramics are proposed and discussed.[[fileno]]2020323010119[[department]]材料科學工程學