Structure and dielectric properties of (1-x)Na0.5Bi0.5TiO3-xNa0.5K0.5NbO3 ceramics

The solid solutions of the (1-x)Na 0 . 5 Bi 0 . 5 TiO3-xNa 0 . 5 K 0 . 5 NbO3 system were produced by the conventional ceramic technology using mechanical activation of the synthesized product. It was found that in the (1-x)Na 0 . 5 Bi 0 . 5 TiO3-xNa 0 . 5 K 0 . 5 NbO3 system at room temperature, a number of morphotropic phase transitions occur: rhombohedral → cubic → tetragonal → monoclinic phases. The introduction of a small amount of Na 0 . 5 K 0 . 5 NbO3 leads to an increase in the temperature stability of the dielectric properties of ceramics. A change in the relaxor properties of the solid solutions of the (1-x)Na 0 . 5 Bi 0 . 5 TiO3-xNa 0 . 5 K 0 . 5 NbO3 system was shown. The increase in energy density and energy efficiency was found at additive 10 mol.% of Na 0 . 5 K 0 . 5 NbO3.