Study On Sintering Of Potassium Sodium Niobate Based Lead-Free Piezoelectric Ceramics

In this thesis, the effects of heating schedules and sintering aids on the densification, phase compositions, microstructure and electrical properties of [(K0.458Na0.542)0.96Li0.04](Nb0.85Ta0.15)03 (KNLNT) ceramics have been studied by X-ray diffractions (XRD), scanning electron microscopy (SEM) and impedance spectroscopy (IS). It is found that the sinterability and piezoelectric constant of KNLNT ceramics was enhanced by annealing at 1000℃for 20 h. And the density and piezoelectric constant of KNLNT ceramics reach the highest value with addition of 0.5wt% 0.5K2O·0.5Na2O·2GeO2 (KNG). Transient liquid phase sintering come true with addition of KNG by introducing vacant site in KNLNT matrix. These results provide guidance for development lead-free piezoelectric ceramics with high properties.