Influence of the sintering temperature on ferroelectric properties of potassium-sodium niobate lead-free piezoelectric ceramics

CORTES, J. A.; CAMARGO, J.; RACHIA, M. F.; RUBIO-MARCOS, F.; RAMAJO, L.; CASTRO, M.; RAMIREZ, M. A.

Journal of Advanced Dielectrics

World Scientific Publishing Co. Pte Ltd

Año: 2021

2010-135X

The effect of sintering condition on structure, microstructure, and ferroelectric properties of (K0.44Na0.52Li0.04) (Nb0.86Ta0.10Sb0.04)O3 (KNL-NTS) has been investigated. Lead-free ceramic powders have been synthesized by the solid-state reaction method and sintered at different temperatures (1115 ºC, 1125 ºC, and 1140 ºC). Then, samples were characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. Through XRD results the perovskite structure and small peaks corresponding to a secondary phase were detected. Ceramics processed at the highest temperatures showed higher densities and good piezoelectric properties (d33, Kp, and Kt), particularly specimens sintered at 1125 ºC presented the highest piezoelectric performance.