PIEZO CERAMIC MATERIAL Russian patent published in 2009 - IPC C04B35/491 H01L41/187 

FIELD: construction.

SUBSTANCE: invention relates to ferrotough piezo ceramic materials stable to electric and mechanic effects. The said materials are intended for ultrasonic instruments including multilayer instruments and those operating under severe electric and mechanic conditions. Piezo ceramic material includes the following: litharge (PbO), Cadmium oxide (CdO), Zirconium oxide (ZrO₂), Titanium oxide (TiO₂), Manganese oxide (MnO₂). In addition, it includes Strontium oxide (SrO), Zink oxide (ZnO), Lanthanum oxide (La₂O₃), Bismuth oxide (Bi₂O₃) and iron oxide (Fe₃O₃) at the following ratio of components, wt %: PbO 63.233-65.404, CdO 0.099-0.490, ZrO₂ 18.990-19.539, TiO₂ 11.141-11.471, MnO₂ 0.131-0.532, SrO 1.318-2.226, ZnO 0.248-0.995, La₂O₃ 0.643-0.768, Bi₂O₃ 0.470-1.900, Fe₂O₃ 0.099-0.490.

EFFECT: development of ferrotough piezo ceramic material with improved main functional parametres and increased factor of mechanic quality, electromechanical coupling factor, low angle tangent of dielectric losses and low temperature of agglomeration.

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