Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Fluorite structure type ceria type solid electrolyte
 A defective fluorite structure type solid electrolyte of the following formula (1): EQU {(M.sub.1-a A.sub.a).sub.x Ce.sub.1-x }O.sub.2-y (1) wherein 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. 
Tosoh Corporation
Y Y H C
Y02E Y02P H01M C04B
additional additional inventional inventional
Hiroshi Hideto Toshiyuki
Yamamura Kuramochi Mori