METHOD OF PRODUCING POWDERED TRISULPHIDES OF EUROPIUM, LANTHANIDE AND COPPER Russian patent published in 2011 - IPC C01F17/00 

FIELD: chemistry.

SUBSTANCE: invention relates to inorganic chemistry and specifically to a method of producing complex sulphides of rare-earth elements used as semiconductor materials. The method of producing powdered trisulphides of europium (II), lanthanide (III) and copper EuLnCuS₃ (Ln=La-Lu) involves exposing an initial charge of an argon stream to sulphiding gases (H₂S, CS₂), obtained from decomposition of ammonium rhodanide. The initial charge used is a mixture of simple and complex oxides obtained via thermal decomposition at 1000 K together with crystalline nitrates of copper, europium and lanthanide. Sulphidation takes place in a stream of H₂S and CS₂ (4-6 eq/l) at 970 K for 15 hours, at 1120 K for 7 hours and at 1220 K for 3 hours.

EFFECT: invention enables to shorten duration and lower temperature of synthesis, increase phase homogeneity during synthesis of trisulphides EuLnCuS₃ (Ln=La-Lu) and obtain substances in an active state for pressing.

2 cl, 3 ex