A MATERIAL FOR INTERFERENCE COATINGS AND A PROCESS FOR PREPARATION THEREOF

摘要

The invention concerns material for interferential coverings, which contains aluminium fluoride and europium (III) fluoride. Also disclosed is a process for preparation of given material which consists in mixing aluminium hydroxide and europium (III) oxide, grinding the obtained mixture and fluorination with fluorine hydrogen acid. The mixture processed in this way is dried in vacuum at 740-760 DEGREE C, and the obtained product is grinded, pressed in tablets and roasted at 540-560 DEGREE C in the atmosphere of inert gas.