摘要:
The invention concerns a compound based on at least an element A selected among alkaline-earths, at least an element B selected among aluminium, gallium or indium, sulphur and a doping agent capable of providing said compound with luminescent properties. The invention is characterised in that it is in the form of a mixture of a majority crystallographic phase of type AB2S4 and a crystallographic phase of type B2S3. Said compound is prepared by a method which consists in: forming a solution or a suspension comprising salts or sols of elements A, B and doping agent, in a proportion such that the atomic ratio B/(A+doping agent) is at least 2.06; spray drying the solution or suspension; sulphidizing the resulting product. Said compound can be used as luminophore, in particular in cathodoluminescence.
摘要:
The invention concerns a compound based on at least an element A selected among alkaline-earths, at least an element B selected among aluminium, gallium or indium, sulphur and a doping agent capable of providing said compound with luminescent properties. The invention is characterised in that it is in the form of a mixture of a majority crystallographic phase of type AB2S4 and a crystallographic phase of type B2S3. Said compound is prepared by a method which consists in: forming a solution or a suspension comprising salts or sols of elements A, B and doping agent, in a proportion such that the atomic ratio B/(A+doping agent) is at least 2.06; spray drying the solution or suspension; sulphidizing the resulting product. Said compound can be used as luminophore, in particular in cathodoluminescence.
摘要:
L'invention concerne un support pourvu d'un piètement en bois pouvant être réalisé d'une manière simple et peu coûteuse, mais présentant une grande rigidité. Le piètement (3) se compose de trois pieds (4, 5, 6) qui sont croisés et assemblés dans une zone médiane et dont les extrémités supérieures (4′, 5′, 6′) sont fixées à un élément d'assise (1) du support. Les pieds sont pourvus d'entailles latérales permettant leur assemblage mutuel par emboîtement. Chaque pied peut être fixé à l'élément d'assise (1) par une simple vis, de sorte que le piètement est démontable et que le support peut être monté par une personne non qualifiée. Applications : sièges individuels ou à plusieurs places, chaises, tables, guéridons.