Centre National De La Recherche Scientifique

L'etat Francais, Represente Par Le Delegue General Pour L'armement

Université De Rennes I

Ceramiques Et Composites

Cernix

Yves Laurent

Patrick Verdier

Jean Guyader

Yves Colin

Roger Marchand

Paul L'Haridon

Jacques Dunogues

Jean-Paul Pillot

Marc Birot

Claudette Drouet

Erik Mennessier

John Razafindrakoto

Gabriel Rosse

Laurence Bois

Jean Rocherulle

Paul Grange

Laurence Poquillon

Philippe Antoine

Jean-Michel Turmel

Odile Merdrignac

A boron and silicon oxynitride obtained by preparing a polyborosiloxane precursor, conducting nitriding pyrolysis of the precursor to obtain an amorphous boron and silicon oxynitride, and optionally conducting additional pyrolysis to obtain a crystallized boron and silicon oxynitride. The polyborosiloxane precursor is prepared by condensation, in the presence of a catalyst, of (2) a polychlorosilane represented by the formula R,R,SiCl,in which the substituents R,and R,are identical or different and each represents a hydrogen atom, a chlorine atom, a linear or branched alkyl or alkenyl or alkynyl radical having 5 or less carbon atoms, or an aryl or aralkyl radical having 6 to 18 carbon atoms, with (2) an alkyl borate represented by the formula (R,O),B in which R,represents a linear or branched alkyl radical having 1 to 5 carbon atoms.

Method of preparing silicon and boron oxynitrides

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 new conductive perovskites containing oxygen and nitrogen, their preparation and their use particularly as electrode material. The conductive perovskites containing oxygen and nitrogen according to the invention correspond to the general formula I

Multi-layer ceramic capacitors having, as the conductive elements

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 new nitrogen or oxynitrogen compounds of perovskite structure, corresponding to the general formula I:

Nitrogen or oxnitrogen compounds having a perovskyte structure, their

Nitrides and oxynitrides which can be used as selective detectors of reducing gases in the atmosphere, and a detection device containing them. Selective detectors of nitrogen-containing reducing gases in the atmosphere, in particular ammonia and gases containing NH and/or NH.sub.2 groups, of the semiconductor resistance type, the nitrides and oxynitrides according to the invention are of tetrahedral structure and contain:

Nitrides and oxynitrides which can be used as selective detectors of

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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Thorigne-Fouillard, France

Yves Laurent