Solid solutions, applicable as catalysts, with perovskite structure comprising noble metals

Materials with a perovskite structure in form of solid solutions with general formula : AzZr1—xBxO3 Where A is Ba or a rare earth element, B is Pt, Ir, Rh or Ce z is 1 when A is Ba and is ⅔ when A is a rare earth, x is in the range 0.01 and 0.8.