A procedure is described for preparing barium titanyl oxalate tet rahydrate, BaTiO (Cz0 4h4 HzO, in which the mole ratio of TiOz to BaO is unity. To achi eve this ratio the alt must be precipitated from solutions that do not contain sodium, potassium, or ammonium ions.Ignition of barium titanyl oxalate tetrahydrate produces barium titanate, BaTi03• To prepare barium titanate free of strontium, the barium chloride used must be specially purified.

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