PURPOSE: To obtain the titled fine Ta2O5 particles having high sphericity and a narrow distribution of particle diameters by adding an aq. alcoholic soln. to the alcoholic soln. of a tantalum alkoxide under controlled conditions and hydrolyzing the tantalum alkoxide.
CONSTITUTION: The aq. alcoholic soln. is added to the alcoholic soln. of the tantalum alkoxide and the tantalum alkoxide is hydrolyzed to produce the fine Ta2O5 particles. In this case, the concn. of the tantalum alkoxide in the reaction soln. is regulated to ≤0.2mol/l, the amt. of water is controlled to the amt. 0.7W1.3 times the equivalent amt. necessary for the hydrolysis of the tantalum alkoxide, the alcohol 0.5 times the total amt. of the reaction soln. is added immediately after the aq. alcoholic soln. is added, then the reaction soln. is agitated to form and grow fine Ta2O5 particles. Consequently, fine Ta2O5 particles having high sphericity and a narrow distribution of particle diameters can be obtained.
MIZUTANI KOREYASU
ISHIZAWA NOBUO
KIEDA NOBUO
MITARAI MASAAKI
SUMITOMO METAL MINING CO
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