[...] comprising noble metals and their use as catalysts

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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 2/3 when A is a rare earth, x is in the range 0.01 and 0.8.