PIEZOELECTRIC CERAMIC MATERIAL Russian patent published in 2013 - IPC C04B35/495 

FIELD: chemistry.

SUBSTANCE: invention relates to production of piezoelectric ceramic materials and can be used in making high-frequency electromechanical transducers particularly used in ultrasonic delay lines (used in the 20-30 MHz range), highly sensitive single-response crystals operating on thickness vibrations; in devices where weight characteristics are decisive. The piezoelectric ceramic material based on sodium niobate contains sodium, niobium, lithium, strontium, aluminium and manganese oxides, with the following ratio of components, wt %: Na₂O 16.28-16.50, Nb₂O₅ 79.61-80.71, Li₂O 1.12-1.14, SrO 0.63-0.64, Al₂O₃ 0.31-0.32, MnO₂ 0.69-2.05. The material is produced using conventional ceramic processing. The firing temperature during synthesis is equal to 1133 K.

EFFECT: material has low relative permittivity of polarised samples, high piezoelectric sensitivity on the thickness vibration mode, sufficiently high mechanical Q-factor, as well as high sound speed, low density and high piezo-anisotropy.

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