Boric Acid → Barium

Reaction equation

O.O.O.O.O.O.O.O.[OH-].[Ba+2:10].[OH-].[B:12]([OH:15])([OH:14])[OH:13]>>[B:12]([O-:15])([O-:14])[O-:13].[Ba+2:10].[B:12]([O-:15])([O-:14])[O-:13].[Ba+2:10].[Ba+2:10].[Ba:10].[B:12]

Participants

Reactant 2

HCID 7628Boric Acid

HCID 17749109Barium hydroxide, octahydrate

Product 3

HCID 5355457Barium

HCID 5462311Boron

HCID 18518886Bariumborate

Procedure

A filtered solution of barium hydroxide octahydrate reacted with an aqueous solution of boric acid to provide hydrated γ barium borate having a barium to boron ratio of 1:2 and having fine particle size. The hydrated γ barium borate was converted to the anhydrous γ form at about 300° to 400° C. Further heating to about 600° to 800° C. converted the product to β-BaB2O4. The conversion to the β-form is preferably during sintering of a ceramic dielectric composition to which the γ-BaB2O4 has been added as a flux.