PIEZOCERAMIC MATERIAL Russian patent published in 2001 - IPC

FIELD: manufacture of piezoids for power equipment. SUBSTANCE: piezoceramic material has lead, zirconium, titanium, strontium, niobium, zinc, manganese, and lanthanum oxides in its composition, their proportion is as follows, mas. %: PbO, 66.00- 66.60; ZrO₂, 19.30-19.70; TiO, 11.10-11.40; SrO, 1.45-1.65; Nb₂O₅, 0.87- 1.00; ZnO, 0.23-0.27; MnO, 0.13-0.15; La₂O₃, 0.30-0.50. Material possesses medium elastance and its tgδ complies with best values specified for this class of compounds (0.30-0.50%); its K_p is 0.67-0.68 , is very high d₃₁ ((200-235)·10^-12 Kl/N), Q_m = 200-300. EFFECT: improved quality of material. 2 tbl