Аннотация:Influence of cation substitution on phase content, crystal structure parameters, microstructure, and dielectric properties of (1-x-y)(Na0.5Bi0.5)TiO3 –xBaTiO3 – y(K0.5Na0.5)NbO3 ceramics with x = 0.05, y = 0–0.15 and additionally modified by 1.5 w.% of ZnO was studied. The samples prepared by the solid-state reaction method are characterized by phase transitions with corresponding peaks of dielectric permittivity at ~550–600 K and anomalies near ~350–425 K. A decrease in the unit cell parameters changes was observed in modified compositions correlating with radii of substituting cations. A decrease in the temperatures of phase transitions Tm and Td was observed as well. Additionally, effects of dielectric relaxation caused by the formation of oxygen vacancies in ZnO-doped samples were observed at temperatures >700 K. An increase in the dielectric permittivity value at the room temperature was observed at y = 0.10 and at y = 0.05 in ZnO modified samples confirming prospect of functional properties improvement.
