Methods of fabricating barium titanate powders
First Claim
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1. A method of fabricating barium titanate powders made from titanium tetrachloride and barium hydroxide as raw materials, comprising:
- (a) providing a titanium tetrachloride solution;
(b) adding excess ammonium aqueous solution into the titanium tetrachloride solution;
(c) adding a barium hydroxide aqueous solution into the titanium tetrachloride solution;
(d) adding a potassium hydroxide into the titanium tetrachloride solution to adjust the pH value of the titanium tetrachloride solution into a strongly alkaline range;
(e) heating the titanium tetrachloride solution to a reaction temperature at normal pressure in a nitrogen-containing environment, and performing a stable hydro-thermal reflux reaction for the titanium tetrachloride solution; and
(f) after the hydro-thermal reflux reaction is completed, a product thereof is treated by an ion exchange resin until the product is substantially neutral, and then is dried to obtain barium titanate powders.
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Abstract
A method of fabricating barium titanate powders uses titanium tetrachloride and barium hydroxide as reactants in a reaction solution. The pH value of the reaction solution is adjusted to strongly alkaline range by adding potassium hydroxide. Nitrogen is charged into a reaction tank at normal pressure, and the reaction solution is heated at 80–102°. The solution is intensively stirred at constant temperature, and then subjected to a hydro-thermal reflux. Then, the solution is treated through an ion exchange resin and dried to obtain a cubic BaTiO3 powders.
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Citations
9 Claims
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1. A method of fabricating barium titanate powders made from titanium tetrachloride and barium hydroxide as raw materials, comprising:
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(a) providing a titanium tetrachloride solution; (b) adding excess ammonium aqueous solution into the titanium tetrachloride solution; (c) adding a barium hydroxide aqueous solution into the titanium tetrachloride solution; (d) adding a potassium hydroxide into the titanium tetrachloride solution to adjust the pH value of the titanium tetrachloride solution into a strongly alkaline range; (e) heating the titanium tetrachloride solution to a reaction temperature at normal pressure in a nitrogen-containing environment, and performing a stable hydro-thermal reflux reaction for the titanium tetrachloride solution; and (f) after the hydro-thermal reflux reaction is completed, a product thereof is treated by an ion exchange resin until the product is substantially neutral, and then is dried to obtain barium titanate powders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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