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.
|ジャーナル||Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy|
|出版ステータス||Published - 2011 10|
ASJC Scopus subject areas
- Mechanical Engineering
- Industrial and Manufacturing Engineering
- Metals and Alloys
- Materials Chemistry