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Material is made from a rare earth-calcium chromite-titanate or a rare earth-calcium chromite-titanate in a mixture with MexZr1-xO2 or MeCe1-xO2 (where Me = alkaline earth metal or rare earth). - An INDEPENDENT CLAIM is also included for a process for the production of the above material comprising heating treating a powder mixture containing CaCO3, CrO3 and TiO2 at 800 deg. C.