PIEZOELECTRIC CERAMIC MATERIAL Russian patent published in 2015 - IPC C04B35/495 H01L41/187 

FIELD: chemistry.

SUBSTANCE: invention relates to piezoceramic materials and can be used in production of ultrasonic converters, in particular devices for medical diagnostics. Piezoceramic material based on system of solid solutions of aNaNbO₃+bKNbO₃+cCuNb₂O₆ (a+b+c = 100%) contains sodium, potassium, niobium and copper oxides with the following component ratio, wt %: Na₂O - 8.56÷8.75, K₂O 12.75÷13.01, Nb₂O₅ 77.28÷77.35, CuO 1.16 or Na₂O 9.22÷9.50, K₂O 11.69÷12.09, Nb₂O₅ 77.53÷77.64, CuO 1.16. The result is conditioned by formation in the process of sintering of intermediate Cu-containing compounds with low melting temperature, with which formation of liquid phases, densification of the structure and, therefore, reducing sample resistance at frequency of piezoelectric resonance, is associated with.

EFFECT: material is characterised by higher mechanic quality factor (Q_m = 500), lower value of relative permittivity (ε^T ₃₃/ε = 345) with preservation of high piezoelectric characteristics.

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