Abstract

From aqueous solutions of barium and titanium citrates two different (BaTi) citrate salts can be precipitated, depending on the pH of the solution. The ratio of barium to titanium in the salts is either 1 : 1 or 2 : 1. The thermal decomposition of the salts was investigated by means of DTA, TGA, infrared spectroscopy, and X-ray diffraction. At about 550°C, all specimens having a barium to titanium ratio of 1 : 1 showed the overall composition TiO 2 · BaCO 3. Prior to the formation of BaTiO 3, recrystallization and separation of small amounts of BaCO 3 and of an intermediate phase was observed. The formation of BaTiO 3 is completed already at 600 to 700°C. Complete mixing of the Ba and Ti on an atomic scale seems doubtful.

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