METHOD FOR SYNTHESIS OF CERIUM OXYFLUORIDE DOPED WITH RARE EARTH ELEMENT Russian patent published in 2023 - IPC C01F17/265 C01F17/259 C01F17/235 C01F17/241 C01F17/30 C09K11/55 C09K11/86 

FIELD: chemical industry.

SUBSTANCE: manufacture of luminescent materials, catalysts, biomedical sensors, as well as materials for high-temperature oxygen-ion conducting membranes. At the first stage of synthesis of cerium oxyfluoride doped with a rare earth element, for which samarium is used, a precursor is synthesized based on cerium dioxide doped with samarium, having the chemical composition Ce_1-(x+y+z)Sm_zO_{2-2x-2y-z /2}, where Sm is samarium, x=0-0.02; y=0.02; z=0.16-0.18, in a combustion reaction with organic fuel - glycine and citric acid. The synthesized precursor is additionally doped with one or more alkaline earth metals (M1, M2) and fluorine through a solid-phase reaction with the fluoride of a given alkaline earth metal at a temperature of 800°C in a quasi-enclosed volume, described by the equation Ce_{1-(x + y + z)}Sm_zO_{2-2x-2y-z / 2}+yM1F₂+xM2F₂ → Ce_1-(x+y+z)Sm_zM1_yM2_xO_2-2x-2y-z/2F_2(x+y). The amount of alkaline earth metal fluoride and the chemical composition of the precursor used are calculated according to the equation of the specified reaction based on the given content of samarium (z) and fluorine (2(x+y)). To carry out synthesis in a quasi-enclosed volume, the said precursor and fluorides of the said alkaline earth metals are placed in an alundum crucible, which is placed in a larger alundum crucible and covered with an alundum lid.

EFFECT: ability to produce cerium oxyfluoride with the composition Ce_1-(x+y+z)Sm_zM1_yM2_xO_2-2x-2y-z/2F_2(x+y) doped simultaneously with samarium and one or more alkaline earth metals, with varying content of these dopants and fluorine.

2 cl, 3 ex