METHOD FOR PRODUCING POWDER COMPOUNDS OF RARE EARTH ELEMENTS DIOKSOSULFIDOV Ln2O2S AND SOLID SOLUTIONS BASED ON THEIR Ln'2O2S-Ln''2O2S (Ln, Ln ', Ln' '= Gd-Lu, Y)

摘要

A method of producing powders LnOS compounds, solid solutions systems (Ln, Ln '= Gd-Lu, Y) by preparing the charge and its subsequent processing in the flow of regenerative and sulfiding gas, characterized in that for single-phase powders dioksosulfidov rare earth elements and their solid solutions, the initial batch is prepared by adding to solutions of nitrates of rare earths sulfuric acid by precipitation, co-precipitation, and crystallization, co-crystallization of sulfates of rare earth elements, the charge thermally obrabaty vayut in air at 600 ° C for 2-3 hours, ground to less than 100 micron fraction and treated in a hydrogen stream at 500-600 ° C for 5-7 hours at a hydrogen feed rate 7.8 liter / hr (standard conditions) relative to the weight of the starting anhydrous sulfates of rare earth elements of 0.02-0.03 moles, and then treated in the HS stream at 850-950 ° C for 10-13 h at the same feed speed HS.