Oxide ion conductor, used in solid oxide fuel cells, in gas sensor and oxygen separating membrane in electrochemical oxygen pump consists of lanthanide oxide

摘要

Oxide ion conductor with the formula (I) is novel. Formula (I) is : Ln1AxGa1-y+z+wB1yB2zB3wO3-d (I) where, Ln1 = La, Ce, Pr, Nd or Sm; B1 = Mg, Al or In; B2 = Co, Fe, Ni or Cu; B3 = Al, Mg, Co, Ni, Fe, Cu, Zn, Mn or Zr; x = 0.05-0.3; y = 0.025-0.29; z = 0.01-0.15; w = 0.01-0.15; y + z + w = 0.035-0.3; and d = 0.04-0.3. An Independent claim is also included for a process for the production of an oxide ion conductor comprising mixing powdered oxides of Ln1, A, Ga, B1 and B2 to form a first powdered mixture; calcining the mixture at 500-1300 deg C for 1-10 hours to form a calcined powder; mixing a powdered oxide of B3 with the calcined powder to form a second powdered mixture; molding the second powdered mixture to give a molding of predetermined shape; and sintering at 1200-1600 deg C for 0.5-20 hours.