HIGH-FREQUENCY PIEZOELECTRIC CERAMIC MATERIAL BASED ON BISMUTH FERRITE AND LEAD FERRONIOBATE Russian patent published in 2025 - IPC C04B35/26 C04B35/497 H10N30/01 

FIELD: chemistry.

SUBSTANCE: invention relates to piezoelectric ceramic materials based on ferrites and can be used to create highly sensitive piezoelectric transducers for various purposes operating in the frequency range of 7.0-10.0 MHz. Piezoceramic material with chemical formula (1-x)BiFeO₃-xPb(Fe_0.5Nb_0.5)O₃, where x=0.3, contains over stoichiometry germanium oxide GeO₂, at following ratio of initial components, wt.%: Bi₂O₃ 57.23-57.26, Fe₂O₃ 23.81-23.83, PbO 11.75-11.76, Nb₂O₅ 6.99-7.00, GeO₂ 0.22-0.15. Introduction of glass-forming additive of germanium oxide into solid solutions of binary system transforms it into single-phase state with one rhombohedral phase. As a result, Ge⁴⁺ ions are partially or completely embedded in its crystal lattice, thus providing a single-phase pure material.

EFFECT: increased anisotropy of piezomodules d₃₃/|d₃₁| to values of 5.0-5.7, reduction of mechanical quality factor to values of 100-150, reduction of temperature of the first and second synthesis and sintering while maintaining average values of relative permittivity of polarized samples, ε^T₃₃/ε_0, equal to 300-400.

1 cl, 8 dwg, 4 tbl