Centre National De La Recherche Scientifique

Agence Nationale De Valorisation De La Recherche (anvar)

Gilles H Fonteneau

Jacques Lucas

Abdelmajid Bouaggad

Fluoride glasses comprise at least one fluoride of each of the following five categories:

Indium-based fluoride glasses and their preparation

Fluoroglasses, their preparation and intermediate products obtained. These glasses are characterized by containing as the forming element at least about 10% by moles of a metal fluoride or mixture of metal fluorides of the formula MF.sub.n, n being a number equal to 3 or 4, M representing a 5f transition metal when n=4 (fluoride MF.sub.4) and a 4f transition metal or yttrium when n=3 (fluoride MF.sub.3), it being understood that said glasses are free of hydrofluoric acid as the forming element.

Fluoride glass compositions based on actinides or yttrium

Halogen glass is treated, while heated above its fusion temperature, with carbon disulphide. The resulting halogen glass is essentially free of parasitic absorption bands in the infra-red spectrum. The treatment with carbon disulphide apparently lowers the hydroxyl ion content and the metal-oxygen bonds sufficiently to avoid the infra-red absorption bands.

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Chateaugiron, France

Gilles H Fonteneau