METHOD FOR MANUFACTURING PIEZOCERAMIC MATERIAL BASED ON SOLID SOLUTIONS OF POTASSIUM-SODIUM NIOBATE Russian patent published in 2015 - IPC C04B35/495 C04B35/64 

FIELD: chemistry.

SUBSTANCE: solid-phase reaction is carried out to synthesise the compounds KNbO₃ and NaNbO₃, which are added to furnace charge; the furnace charge is activated by milling in a planetary mill with the use of grinding media having a high specific surface; work pieces are sintered in an enclosure in the presence of filled powder NaNbO₃.

EFFECT: improving sintering properties, increasing density of piezoceramic materials, providing an ability to resist the severe polarisation environment for the more complete re-orientation of ferroelectric domains, reducing raw material consumption in ready product manufacturing by avoiding the formation of stable intermediate phases leading to stoichiometric impurity of the material, and by reducing Na₂O volatility accompanying the sintering process.

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