Low temperature synthesis of titanium complex oxides by a new synthetic route of waters-oluble titanium complex from titanium chloride and titanium sulfate as starting materials

Water-soluble titanium complexes are attractive titanium sources for solution synthesis of titanium-based materials using water as a solvent due to their high stability in aqueous solution in wide range of pH, and have been made from expensive metal titanium ultrafine powder. In this study, TiCl ₄ and Ti(SO ₄₎₂ that are inexpensive reagents than metal titanium fine powder were chosen as starting materials. TiC1 ₄ and Ti(SO ₄) ₂ were dropped into distilled water and large amount of NaOH solution was added here, then precipitates of Ti(OH) ₄ were obtained. Then precipitates were washed with distilled water and dissolved into mixed solution of H ₂O ² and NH ₃. And lactic acid as complexing agent was added to the solutions to obtain water-soluble titanium lactate complex solutions. These complex solutions generated no precipitate at pH O to 12 for 6 months. Yields of Ti in the both processes were 85% and removal ratios of Cl- and SO ₄ ^2- ions were 99 and 93%, respectively. MCO ₃ (M = Ca ²⁺, Sr ²⁺, Ba ²⁺) were dissolved in the complex solution prepared from TiC1 ₄, and the solution was dried and heated at 873 K for 5 h. Very fine and crystalline particles Of CaTiO ₃, SrTiO ₃ and BaTiO ³ were obtained by heating at 873 K in this solution method, while large particles Of CaTiO ₃, SrTiO ³ and BaTiO ₃ were obtained at 1273 K in solid-state reaction. Low temperature synthesis of titanium complex oxides by a new synthetic route of water-soluble titanium complex from titanium chloride and titanium sulfate as starting materials was successfully achieved.