METHOD OF PRODUCING COMPLEX OXYSULPHIDE COMPOUNDS OF EUROPIUM AND TRANSITION ELEMENT Russian patent published in 2025 - IPC C01F17/294 C01G25/00 C01G33/00 C01G39/00 C01G49/00 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical and semiconductor industry. Complex oxysulphides of rare-earth and transition elements are obtained by three-step synthesis. At 1st stage, an X-ray amorphous nanosized solid solution of the initial salts is synthesized by the method of a supercritical anti-solvent, which contributes to a decrease in the annealing temperature at the subsequent stages. Starting salts used are europium acetate, iron lactate or zirconium acetylacetonate in ratio 1.5 Eu₂O₃ to 2.4 Fe₂O₃ when producing said compound with a garnet structure, and 1 Eu₂O₃ to 1.85 ZrO₂ when producing said compound with a pyrochlore structure. At 2nd stage, the product obtained at 1st stage is annealed in oven at 500 °C. At 3 stage, vacuum-ampoule synthesis of the target compound is carried out in furnace at 1000 °C by reacting amorphous complex oxide obtained at step 2 with transition element sulphide – NbS₂ or MoS₂. Using said method, complex oxysulphides of rare-earth and transition elements with a garnet structure of the composition Eu₃Fe_5-xMo_xO_12-2xS_2x and Eu₃Fe_5-xNb_xO_12-2xS_2x, where x = 0.15, or pyrochlore of the composition Eu₂Zr_2-xMo_xO_7-2xS_2x and Eu₂Zr_2-xNb_xO_7-2xS_2x, where x = 0.15, in which part of the cationic positions is isomorphically substituted with cations of transition metals in the lowest oxidation state, and part of the anion positions is substituted with sulphur.

EFFECT: invention can be used in making elements of electronic equipment from materials combining both semiconductor and magnetic properties.

1 cl, 6 dwg, 1 tbl