Abstract
Effect of pH on the formation of stoichiometric coprecipitated precursors for BaTiO 3 from potassium titanyl oxalate and barium chloride was investigated in the pH range 2.0 to 10.0. Thermal analysis revealed that barium titanyl oxalate could be obtained only below pH=3.0. Increase in pH up to 5.0 led to the formation of barium titanyl hydroxy oxalate, while a two phase mixture of barium oxalate and titanyl hydroxide was observed at pH=7.0 to 10.0. Thermal decomposition of only barium titanyl oxalate yielded stoichiometric BaTiO 3 at 600°C.
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