Structure and ferroelectric properties of lead-free NBT-KBT-BF ceramics

Phase formation, crystal structure parameters, dielectric and ferroelectric properties of ceramic solid solutions in the (1-y)[(1-x)(Na0.5Bi0.5)TiO3-x(K0.5Bi0.5)TiO3]-yBiFeO(3) system with x = 0.25, y = 0 - 0.6 has been studied. Pure samples with the pseudocubic perovskite structure were obtained by the solid state reaction method. Addition of BiFeO3 stimulated a monotonous increase in the unit cell volume and in the Curie temperature T-m value. With increasing the BiFeO3 content, nonmonotonous behaviour of the dielectric permittivity, a decrease in the T-ph value, a decrease in total electroconductivity and dielectric loss at the room temperature were revealed.