Ferroelectric Properties of Bi<sub>0.5</sub>(Na<sub>0.8</sub>K<sub>0.2</sub>)<sub>0.5</sub>TiO<sub>3</sub> Ceramics

Abstract

Different processing conditions and the effect of secondary phases on ferroelectric properties of Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 (BNKT) are studied. Ceramic powders are prepared by solid state reaction and different sintering temperatures (temperatures between 1075 and 1150°C) are analyzed. Finally, samples are characterized by X-ray diffraction, Raman microspectroscopy, Scanning Electron Microscopy, impedance spectroscopy, and density measurements. Through XRD patterns, the perovskite structure is stabilized; together with small peaks corresponding to a secondary phase associated with K 2-x Na x Ti 6 O 13 phase. Moreover, the content of the secondary phase, d 33 piezoelectric constant and dielectric properties increase with sintering temperature.