A new, lead free, family of perovskites with a diffuse phase transition: NaNbO3-based solid solutions Original Research Article

(1−x)NaNbO3–(x)ABO3 perovskite solid solutions belonging to group II according to the Krainik classification [Izv. Akad. Nauk SSSR, Ser. Phys. 28 (1964) 643] exhibit a dramatic diffusion of the dielectric permittivity ε′ maximum and relaxor-type behavior when the second component concentration exceeds a threshold value x0. The concentration phase transition to this relaxor-like phase is abrupt (of the first order kind) that is seen from the step in the dependence of the ε′(T) maximum temperature, Tm, on x. Some relaxor-like properties appear even at x