Centre National De La Recherche Scientifique

Agence Nationale De Valorisation De La Recherche (anvar)

Université De Rennes 1

Etablissement Public Dit: Agence Nationale De Valorisation De La

Etablissement Public Dit: Centre National De La Recherche Scientifique

Universite Rennes 1

Jacques Lucas

Gilles H Fonteneau

Marcel Poulain

Xiang H Zhang

Michel Poulain

Xianghua Zhang

Hongli Ma

Jean-Luc Adam

Marc Matecki

Abdelmajid Bouaggad

Bruno Bureau

Catherine Boussard

Patrick Houizot

The invention relates to vitreous compositions, in particular of the vitroceramic type, transparent to infrared, production and uses thereof. Said compositions comprise in mol. %: Ge 5-40, Ga&#x3c;1, S+Se 40-85, Sb+As 4-40, MX 2-25, Ln 0-6, adjuncts 0-30, where M=at least one alkaline metal, selected from Rb, Cs, Na, K and Zn, X=at least one atom of chlorine, bromine or iodine, Ln=at least one rare earth and adjunct=at least one additive comprising at least one metal and/or at least one metal salt with the sum of all molar percentages of the components present in said composition being 100.

Vitreous compositions of the vitroceramic type, transparent to infrared

Tellurium and selenium halide-based glasses, their preparation and use

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

Indium-based fluoride glasses and their preparation

A solid vitreous composition has the formula: Te.sub.100-x-z X.sub.x Z.sub.z wherein x represents chlorine, bromine or iodine, Z represents sulfur and/or selenium; x represents the molar percentage of X and ranges from 5 to 67; z represents the molar percentage of Z and ranged from 0 to 60; it being understood that the sum (x+z) ranges from 33 to 85. A method for the preparation of this composition is disclosed as is its use in the field of optoelectronics and infra-red transmission.

Glasses based on tellurium halides, their preparation and their use

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

Halogenated glass comprising 20 to 90 mole percent of at least one of cadmium, manganese and zinc halide and a process for the preparation thereof.

Halogenated glasses

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.

Halogen glasses modified with carbon disulphide and process of

Compositions of fluorinated glasses are disclosed which result from the ternary composition of ZrF.sub.4 or HfF.sub.4, BaF.sub.2 and ThF.sub.4 or UF.sub.4, each component being within a specified range of composition indices, the indices for the separate components totalling unity.

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Betton, France

Jacques Lucas