Process for the synthesis of fluoride glass by the sol - gel met

Details Process for the synthesis of fluoride glass by the sol - gel met Process for the synthesis of fluoride glass by the sol - gel met

1993-04-06

1994-08-30

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 37, 501 40, 65 172, 65388, C03C 332, C03C 1304

Patent

active

053428099

ABSTRACT:
The present invention relates to a process for the synthesis of fluoride glass by the sol-gel method.
The object of the invention is to synthesize an impurity-free fluoride glass.
This object is achieved with the aid of a process having stages consisting of preparing a wet oxygenated gel from precursors containing all the cations constituting said fluoride glass, hydrolyzing said gel, drying said gel and in which the process is characterized in that it also comprises the stage consisting of treating said oxygenated gel by a fluorinating agent in the vapour phase, at a temperature below the glass crystallization point.
This process more particularly makes it possible to produce fluoride glass for optical fibres.

REFERENCES:
patent: 4761387 (1988-08-01), Tokida et al.
patent: 4946490 (1990-08-01), Hall et al.
Nato Asi Ser., Ser. E, 123, 1987, pp. 385-391, D. R. Ulrich, "Interactions with Other Fields".
Chemical Abstracts, vol. 110, No. 12, Jun. 12, 1989, AN 217717p, K. Fujiura, et al., p. 315, Japanese Journal of Applied Physics, vol. 28, No. 1, 1989, pp. L147-L149.
J. Mater. Res., vol. 7, No. 6, Jun. 1992, pp. 1534-1540, A. M. Mailhot, et al., "Reactive Atmosphere Synthesis of Sol-Gel Heavy Metal Fluoride Glasses".

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