METHOD OF PRODUCING POWDER OF SOLID SOLUTIONS OF LANTHANUM, NEODYMIUM, PRASEODYMIUM AND SAMARIUM OXYSULPHIDES Russian patent published in 2013 - IPC C01F17/00 

FIELD: chemistry.

SUBSTANCE: invention relates to inorganic chemistry and specifically to a method of producing powder of solid solutions of rare-earth oxysulphides for making ceramic articles, phosphors and laser materials. The method of producing powder of solid solutions of lanthanum, neodymium, praseodymium and samarium oxysulphides involves preparing a mixture of given mass of weighted forms of rare-earth oxides dissolved in nitric acid, precipitating rare-earth sulphates from the obtained solution using concentrated sulphuric acid, evaporating the formed suspension on air at 70 - 90°C to a dry state, grinding and calcining at 600°C for 1.5 hours, further grinding to a fine state and treating in a hydrogen stream with gas feed rate of 6 eq/h with respect to the weight of rare-earth sulphates at the following temperatures and duration of heat treatment: 600°C - 10 hours, 700°C - 5 hours and 850°C - 1 hour.

EFFECT: efficient production of powder of solid solutions of rare-earth oxysulphides with high phase homogeneity and shorter duration of high-temperature treatment.

2 ex