Patent ID: 7442344

Claim:
An oxygen separation method comprising: using at least one ceramic member having a perovskite-type crystal structure represented by any one of the following (A)-(B): (A) the general formula ( Ln 1−x Sr x )( Ti 1−y Fe y ) O 3 where the Ln represents at least one element selected from lanthanoids; the x satisfies the condition 0.2≦x≦0.6, the y satisfies the condition 0.5≦y<1 and x and y satisfy the condition 1≦x+y≦1.2; and (B) the general formula ( Ln 1−x Ba x )( Ti 1−y Fe y ) O 3 where the Ln represents at least one element selected from lanthanoids, the x satisfies the condition 0.3≦x≦0.7the y satisfies the condition 0.5≦y<1, and x and y satisfy the condition 1≦x+y<1.2, the ceramic member used being formed into a membrane with a thickness of 1mm or less; supplying a gas containing oxygen to the ceramic member; and inducing selective permeation of oxygen ions in the ceramic member.