abstract |
PROBLEM TO BE SOLVED: To provide an oxide ion having a high conductivity even in a low temperature region, having a sufficient mechanical strength and a high-density structure. Provided is an oxide ion conductive ceramic having no problem such as gas permeation. SOLUTION: The oxide ion conductive ceramic according to the present invention is fired at a temperature of 1700 ° C. or more (RE 2 O 3 ) x (SiO 2 ) 6 (RE is La, Ce, It is an element selected from Pr, Nd, and Sm, and x is 3. The condition of 5 <x <6 is satisfied. ), Whose main constituent phase has an apatite crystal structure. |