HIGH-FREQUENCY PIEZOELECTRIC CERAMIC MATERIAL BASED ON LEAD TITANATE-ZIRCONATE Russian patent published in 2022 - IPC C04B35/491 H01L41/187 

FIELD: chemistry.

SUBSTANCE: invention is used for creating piezoelectric converters operating in the high-frequency range in the range of operating frequencies (4.0÷7.0) MHz. The claimed composition of the material corresponds to the chemical formula: (1-x)Pb(Ti_0.5Zr_0.5)O₃ – хCd_0.5NbO₃ (0.035≤x≤0.065) and comprises the following components, wt.%: PbO 64.19 to 66.28, ZrO₂ 17.72 to 18.30, TiO₂ 11.49 to 11.87, CdO 0.69 to 1.28, Nb₂O₅ 2.86 to 5.32. The material is produced by two-stage solid-phase synthesis followed by sintering according to the conventional ceramic technology.

EFFECT: increase in the piezomodules |d₃₁| to the values of (50÷80) pCl/N and d ₃₃ to the values of (150÷180) pC/N; piezosensitivities |g ₃₁| to the values of (10÷12) mV*m/N and g₃₃ to the values of (25÷35) mV*m/N; mechanical quality factor, Q_m, to the values of (250÷300) while maintaining high values of the Curie temperature, T_c, equal to (600÷650) K, sufficiently high values of the coefficient of electromechanical coupling of the planar oscillation mode, K_p, equal to (0.25÷0.30), average values of the relative dielectric permeability, , equal to (500÷700), and low values of the tangent of the angle of dielectric losses, tgδ, equal to (1.0÷1.2)•10^-2, and simplification in the manufacturing technology.

1 cl, 7 ex, 4 tbl