Abstract
Lead free piezoelectric K0.5Na0.5NbO3 (KNN) is synthesised by the conventional solid state mixed oxide route using dry ball milling. Spark plasma sintering technique (SPS) is an original and fast method which enables the grain growth to be controlled and allows to decrease a potential alkali volatilisation. Undoped KNN are sintered by SPS in the 920–975°C temperature range, for dwell times of 5–15min. The density range is 93–97%. Density, grain size and composition of samples are comparatively analysed. Electromechanical performances are measured and related to the microstructure. High planar coupling coefficient kp of 48%, thickness coupling factor kt of 45%, dielectric constant at constant strain ε33S/ε0 of 328, and low mechanical losses δm of 2% are reached for undoped KNN. These results are promising and suitable for transducer applications.
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