Piezoelectric and Ferroelectric Properties of Lead-free 0.9(Na0.97K0.03NbO3)-0.1BaTiO3 Solid Solution

Lead-free piezoelectric 0.9(Na0.97K0.03NbO3)-0.1BaTiO3 ceramic has been synthesized using conventional solid-state reaction method. The results of X-ray diffraction analysis (XRD) show that the prepared sample displays typical perovskite structure with tetragonal space group P4mm. The crystal structure of 0.9(Na0.97K0.03NbO3)-0.1BaTiO3 powder was determined by Rietveld refinement analysis. The charge density distribution of the prepared sample has been investigated by using maximum entropy method. The optical band gap of the solid solution has been investigated using UV-visible spectroscopy (UV-Vis). Scanning electron microscopic (SEM) measurements were performed to study the surface morphology. The elemental composition of the 0.9(Na0.97K0.03NbO3)-0.1BaTiO3 sample was analyzed by energy-dispersive X-ray (EDS) spectrometer. The ferroelectric nature of the sample has been determined through polarization and electric field hysteresis measurements.