Synthesis, Microstructure, Dielectric and Ferroelectric Properties of (Na,Bi,K)TiO<sub>3</sub> Ceramics
Single phase ceramic samples with perovskite structure [(Na<sub>0.5</sub>Bi<sub>0.5</sub>)<sub>1 –</sub><sub>x</sub>K<sub>x</sub>]TiO<sub>3</sub> (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06) have been prepared by solid-state reaction and their structure, microstructure and dielectric and ferroelectric properties have been studied. The increase in unit cell parameters of perovskite lattice as a result of increase in K-cations content in accordance with the ratio of the radii of cations in A-sublattice of perovskite structure is proved. The second harmonic generation method has confirmed that the introduction of potassium cations in the A positions of the perovskite lattice promotes enhancing of the ferroelectric properties of studied samples. Dielectric relaxation effects are revealed, which indicate the presence of vacancies in the oxygen sublattice.