METHOD OF PRODUCING HIGH-ENTROPY IRON-RARE-EARTH GARNET OF COMPOSITION (Ln1Ln2Ln3Ln4Ln5)FeO WITH EQUIMOLAR RATIO OF RARE-EARTH COMPONENTS Russian patent published in 2024 - IPC C01G49/00 C01F17/10 C01F17/32 C30B29/28 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry and can be used in making radio-frequency, microwave and magnetic devices. For production of garnet with composition (Ln1_0.2Ln2_0.2Ln3_0.2Ln4_0.2Ln5_0.2)₃Fe₅O₁₂, where Ln1, Ln2, Ln3 Ln4, Ln5 are different and are selected from a group of rare-earth metals, including Y, Eu, Gd, Dy, Ho, Er and Tb, preparing a reaction mixture containing oxides of said rare-earth metals, dissolved in nitric acid, and an iron-containing compound – n-aqueous iron (III) nitrate, the amount of crystallisation water in which is determined by gravimetric analysis. Obtained reaction mixture is homogenised by ultrasonic treatment at power of not less than 700 W for 0.5 h while maintaining temperature of the mixture of not more than 30 °C. A nitrate-organic precursor is then obtained by adding aminoacetic acid to the mixture as an organic reducing agent required for pyrolysis of said precursor. Semi-finished product obtained by pyrolysis of the precursor is first annealed at temperature of 750 °C for 8 hours and then sintered at temperature of 1,200 °C for 20 hours. When implementing the method according to the invention, only available laboratory equipment, glassware and reagents are used, temperature is reduced, and material consumption is reduced due to use of only one organic reducing agent.

EFFECT: obtained product is single-phase.

1 cl, 8 dwg, 1 tbl, 5 ex