| 摘要 |
PROBLEM TO BE SOLVED: To provide a proton-conducting oxide having the capability to maintain high proton conductivity even if the proton-conducting oxide is exposed to the air atmosphere for a long time.SOLUTION: The present invention provides a proton-conducting oxide comprising a perovskite crystal structure represented by the composition formula ABB'O, where A represents strontium (Sr), B represents a transition metal of Group 4 or cerium (Ce), and B' represents an element of Groups 3 or 13, with 0.84<a<1.0 and 0.0<x<0.2.SELECTED DRAWING: None |
