CHARGE FOR PREPARING PIEZOCERAMIC MATERIAL Russian patent published in 2005 - IPC

FIELD: piezoceramic materials.

SUBSTANCE: invention relates to charge for preparing piezoceramic material that exhibits low tangent angle of dielectric losses tgδ, small mechanical quality factor Q_m (16), low value of acoustic impedance Z ((10-16) x 10⁶ kg/m²s) and retains high values of electromechanical connection coefficient for thickness mode of oscillation K_t (0.51-0.58) and longitudinal piezoelectric modulus d₃₃ (585 x 10^-12 nC). Charge comprises lead, strontium, barium, zirconium, titanium, bismuth, nickel, tungsten oxides and ammonium oxalate monohydrate in the following ratio of components, wt.-%: PbO, 51.00-55.00; SrO, 2.70-2.90; BaO, 1.60-1.70; ZrO₂, 17.90-19.00; TiO₂, 9.40-10.00; Bi₂O₃, 1.20-1.35; Ni₂O₃, 0.10-0.15; WO₃, 0.37-0.45, and (NH₄)₂C₂O₄ x H₂O, 8.50-17.00. Applying the invention is effective in the development of high-frequency transmitter-receiving devices of medicinal ultrasonic technique. Invention provides reducing tangent angle of dielectric losses, mechanical quality factor and value of acoustic impedance.

EFFECT: improved and valuable properties of charge.

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