Patent ID: 7572532

Claim:
An oxide material of the following general formula: A 2−x−y A′ x A″ y M 1−z M′ z O 4+δ (1) where: A is a metal cation selected from the group consisting of lanthanides, alkali metals, and alkaline-earth metals; A′ is at least one metal cation selected from the group consisting of lanthanides alkali metals, and alkaline-earth metals; A″ is a cationic vacancy, that is to say a cation A and/or cation A′ vacancy; M is a metal selected from the group consisting of transition metals; and M′ is at least one metal selected from the group consisting of transition metals said material being such that: 0<y<0.30, 0<δ<0.25, 0 ≦ x ≦ 2; and 0 ≦ z ≦ 1.