METHOD OF PRODUCING FERROELECTRIC CERAMIC MATERIAL BASED ON BISMUTH FERRITE Russian patent published in 2016 - IPC C04B35/26 C04B35/453 C04B35/626 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to production of ferroelectric ceramic materials based on bismuth ferrite and can be used for creation of new materials used in devices for recording, storing and processing information. One prepares a suspension of initial oxides for producing solid solutions of Bi_1-xA_xFeO₃, where A is a rare-earth element, x=0-0.20, and performs mechanical activation in planetary ball mill for 10-20 minutes. Then single-step synthesis at temperature of 800°C for two hours with cooling in furnace to room temperature, additional mechanical activation of generated product in ball planet mill for 10-20 minutes, tempering at 800-900°C with intermediate holding of generated product at temperature of 100-150°C lower than hardening temperature for 40-80 minutes.

EFFECT: lower relative permittivity to values less than 120 at room temperature and higher stability of relative permittivity by reducing the amount of impurities and reducing the number of non-equilibrium defects in ceramics.

2 cl, 2 tbl, 6 dwg