Centre National De La Recherche Scientifique

Ceramiques Et Composites

Cernix

Patrick Verdier

Yves Laurent

Jean Guyader

Claudette Drouet

Yves Colin

Paul Grange

John Razafindrakoto

Laurence Poquillon

Erik Mennessier

Jean Rocherulle

Jean-Michel Turmel

Odile Merdrignac

Method for processing waste containing metal contaminants using a

Glass compositions containing oxygen and nitrogen prepared by melting admixture of magnesia and/or a magnesium silicate, silica and an aluminum nitride produced by reacting ammonia with aluminum oxide, have the formula:

Glass compositions containing oxygen and nitrogen and production of

The present invention relates, a compound for use with selective detectors of the semiconductor resistance type which detect for nitrogenous reducing gases in the atmosphere, especially ammonia and gases containing NH and/or NH.sub.2 groups, said compound comprising the gallium nitride and, oxynitrides of tetrahedral structure according to the general formula: ##EQU1## in which: .quadrature. represents a hole, and 0.ltoreq.x.ltoreq.0.3.

Gallium nitride and oxynitrides used as selective detectors of reducing

The present invention relates to a novel crystalline massive aluminosilicate with an expanded structure and to its process of manufacture. The particular structure is a closed cell structure containing nitrogen. It is obtained by: grinding industrial glass; adding aluminum based nitride in the proportion of 0.1 to 20% by weight with respect to the weight of the ground industrial glass; mixing the ground glass and so-added nitride; oxidizing the nitride within said mixture by heating to a temperature of 800.degree. to 1000.degree. C. for about 1 hour, and cooling and recovering the expanded crystalline aluminosilicate. The material has multiple applications in the building industry and in the construction of furnaces, in the manufacture of fireproof walls and doors, and in naval construction, with various advantages over prior art materials.

Massive crystalline aluminosilicate with expanded structure and process

The present invention relates to neutron-absorbent oxide or oxynitride glasses containing gadolinium and a process for their preparation. The glasses according to the invention, which incorporate silicon, aluminum, oxygen or oxygen and nitrogen, additionally contain gadolinium in a proportion of approximately 5 to 15 atom %.

Neutron-absorbent glasses containing gadolinium and process for their

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Acigne, France

Patrick Verdier