PIEZOELECTRIC CERAMIC MATERIAL Russian patent published in 2013 - IPC C04B35/472 H01L41/187 

FIELD: chemistry.

SUBSTANCE: invention relates to piezoelectric ceramic materials and can be used in low-frequency receivers, hydrophones, sonar operating in hydrostatic mode, acoustic receivers and pressure sensors. The material has the following composition, wt %: PbO 69.39-69.68, Nb₂O₅ 17.98-19.28, TiO₂ 7.46-8.73, MgO 1.76-1.90, NiO 1.08-1.14 and ZnO 0.77-0.83, which corresponds to the phase composition: aPbTiO₃+bPbNb_2/3Mg_1/3O₃+cPbNb_2/3Ni_1/3O₃+dPbNb_2/3Zn_1/3O₃, where a=30.00-35.00 (in mol %), b=41.95-45.41 (in mol %), c=13.93-14.77 (in mol %), d=9.12-9.82 (in mol %), a+b+c+d=100%. Heterovalent modification of the material based on PbO (Pb²⁺), Nb₂O₅ (Nb⁵⁺), TiO₂ (Ti⁴⁺) and ZnO (Zn²⁺) with oxides of divalent metals MgO (Mg²⁺) and NiO (Ni²⁺) results in formation of oxygen vacancies during the sintering process and formation of a ferroelectric soft structure.

EFFECT: high mobility of domain walls and, as a result, high permittivity $${\epsilon }_{33}\raisebox{1ex}{$\text{T}$}\!\left/ \!\raisebox{-1ex}{${\epsilon }_{\text{0}}$}\right.,$$ piezoelectric modulus d₃₃, hydrostatic piezoelectric modulus d_h and hydrostatic Q-factor d_h·g_h, and low mechanical Q-factor Q_m due to higher internal friction with high mobility of domain walls.

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