Barium borate preparation

Details Barium borate preparation Barium borate preparation

1989-04-03

1990-01-30

Stoll, Robert L.

Chemistry of inorganic compounds

Boron or compound thereof

Oxygen containing

423279, 501137, 501139, C01B 3512, C01B 1512, C04B 3546, C04B 3548

Patent

active

048972495

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.

REFERENCES:
patent: 4683126 (1987-07-01), Inoue et al.
patent: 4766027 (1988-08-01), Burn
Chemical Abstracts, vol. 103, No. 26, 216382u, Metal Borates by Direct Conversion of Oxides or Hydroxides of Metals.
Chemical Abstracts, vol. 74, No. 24, 131090e, Physicochemical Study of a Barium Hydroxide-Boric Acid Water System at 30.degree..
E. M. Levin and H. F. McMurdie, "The System BaO--B.sub.2 O.sub.3 ", J. Am. Ceram. Soc. 32, 99 (1949).
O. Yamaguchi, K. Tominaga and K. Shimizu, "Formation and Transformation of Alkoxy-Derived BaB.sub.2 O.sub.4 " Ceramurgia Int., vol. 6(3), pp. 103-105 (1980).

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