HIGH-FREQUENCY PIEZOELECTRIC CERAMIC MATERIAL BASED ON SODIUM NIOBATE Russian patent published in 2021 - IPC C04B35/495 H01L41/187 

FIELD: piezo-equipment.

SUBSTANCE: invention is designed for the creation of piezo-equipment devices operating in the high-frequency range in the operating frequency range of 4.0÷7.0 MHz. Piezoelectric ceramic material contains, wt.%: Na₂O 7.05-7.99, K₂O 13.49-14.73, CdO 1.83-1.84, Nb₂O₅ 75.56-76.15, SiO₂ 0.53-0.83. The material is made by solid-phase synthesis followed by sintering using usual ceramic technology.

EFFECT: increasing the relative dielectric permittivity of polarized samples, the mechanical quality factor and the specific power with maintaining high values of the electromechanical coupling coefficient of the planar mode of vibrations, the piezo-module, the piezo-sensitivity, the piezo quality factor, the sound speed and the low specific weight of ceramics.

1 cl, 1 dwg, 5 ex, 4 tbl