Synthesis and Synthesis Mechanism of Piezoelectric Powder Sodium Potassium Anhydride (KNN) Calcified at High and Low Temperatures

Document Type : Research Article

AMNC.2017.5.20.6

Abstract

The Potassium Sodium Nayobate Ceramic, now known as the KNN, is a lead-free piezoelectric compound due to its good electromechanical properties. The solid state synthesis temperature of KNN powder is generally in the range of 750-950 ° C. In this research, it was examined whether the calcination temperature of KNN powder was still lower and that the zinc absorption and ceramic properties of this low temperature powder were as high as the temperature of the powder? Based on the STA thermal analysis from a mixture of KNN phase precursors, it was found that the temperature range of 550 ± 50 ° C for the synthesis of low-temperature KNN powder can be studied more accurately. Further studies using X-ray diffraction technique showed that double-calcined powders at 550 ° C had no secondary phases or residual materials, especially Nb2O5. The density of the two-hour specimen samples of KNN powder cloned at high temperature (850 ° C) and low temperature (550 ° C) equaled 94% of the density of theoretical measurement. It was found that the secondary phases that can be formed in this system are polysubiable phases formed by the evaporation of alkaline elements, and especially potassium at high temperatures, in both types of ceramic enamel from high-temperature and low-temperature powders . The piezoelectric charge coefficient, the saturation polarization and the retained ceramic of the coated powder at a low temperature were calculated to be 4.30 μC / cm2, 97 pC / N and 24.7 μC / cm2, which is comparable and even higher than The measured values ​​for the coated ceramic from high temperature pyrite are 99 pC / N, 4/29 μC / cm2 and 23.5 μC / cm2 respectively. The results of this study show that without fear of being affected by the final properties of the component, it is possible to reduce the solid state temperature of the KNN.

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References

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