Аннотация:The influence of BiFeO3 on phase formation, crystal structure, and dielectric properties of solid solutions close to the Morphotropic Phase Boundary in the (Na0.5Bi0.5)TiO3 - (K0.5Bi0.5)TiO3 TiO3 system was studied. The formation of samples with pure perovskite structure was proved, increase in the unit cell parameters and in the T-m value while decrease in elelctroconductivity and dielectric loss stimulated by the BiFeO3 addition were revealed.