Fluorite structure type ceria type solid electrolyte

摘要

A defective fluorite structure type solid electrolyte of the following formula (1):PP{(M.sub.1-a A.sub.a).sub.x Ce.sub. 1-x }O. sub.2-y (1)PPwherein M is a trivalent rare earth element other than Ce, A is a monovalent alkali metal or a bivalent alkaline earth metal, and a, x and y are 0 a 0.6, 0.2 x 0.5 and 0 y 0.55, respectively.