Barium borate preparation
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United States of America Patent
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Jan 30, 1990
Grant Date -
N/A
app pub date -
Apr 3, 1989
filing date -
Apr 3, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filtered solution of barium hydroxide octahydrate reacted with an aqueous solution of boric acid to provide hydrated .gamma. barium borate having a barium to boron ratio of 1:2 and having fine particle size. The hydrated .gamma. barium borate was converted to the anhydrous .gamma. form at about 300.degree. to 400.degree. C. Further heating to about 600.degree. to 800.degree. C. converted the product to .beta.-BaB.sub.2 O.sub.4. The conversion to the .beta.-form is preferably during sintering of a ceramic dielectric composition to which the .gamma.-BaB.sub.2 O.sub.4 has been added as a flux.
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