Sol-gel method for preparing an alkaline earth metal borate
AssigneeEastman Kodak Company
InventorsWenjiang Nie, Gustavo R. Paz-Pujalt, Christian Lurin
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Abstract
The present invention concerns a method for preparing earth alkaline metal borates. The method comprises the steps of forming a mixture of an earth-alkaline metal alkoxide and a boron alkoxide, of hydrolysing this mixture to form a metal-borate precursor, and then coating the precursor onto a substrate and thermally treating it to form an inorganic film on the substrate. The method is especially useful to prepare beta barium borate layers which can serve in non-linear optical devices to produce second harmonics generation.
Claims9
A method for preparing a borate of one or more alkaline earth metals, comprising the steps of
- (a) forming a mixture of a boron alkoxide and one or more alkaline earth metal alkoxides in the presence of a volatile solvent,
- (b) hydrolyzing said mixture at a pH between 5 and 8 by adding slowly a mixture of volatile solvent and water, to form a alkaline earth metal borate precursor,
- (c) coating the resulting composition of step (b) on a substrate, and
- (d) heating the coated composition of step (c) so that the solvents and water are removed and an inorganic thin film of alkaline earth metal borate is obtained.
Dependencies are inferred from the claim text.