Abstract
Two new systems, Bi 2O 3Er 2O 3 and ZrO 2Y 2O 3(CaO)Bi 2O 3 were investigated. The first system has a homogeneous cubic, fluorite phase between 17.5 and 45.5 mol % Er 2O 3 and can be sintered to densities near 95% at 1200 K. At temperatures between 700 K and 1000 K the highest value of the a.c. oxygen ion conduction in this system is twice as much as the highest value found in the literature. In the second system concentrations of 1–3 mol % Bi 2O 3 act as an excellent sintering aid for ZrO 2Y 2O 3 and ZrO 2CaO samples which can be sintered to densities higher than 95% at temperatures of 1350 K. During this procedure a liquid ZrO 2Bi 2O 3 phase exists from which Bi 2O 3 partly evaporates with increasing sintering time. The oxygen ion conduction is little affected by the Bi 2O 3-rich second phase. The influence of annealing procedures up to 1570 K on the conduction in the ZrO 2Y 2O 3Bi 2O 3 system is small despite weight losses up to 4%.
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