Atomic substitution effects in binary solid solution systems based upon NaNbO3

Several regular variations of electrophysical properties, which depend on s ubstituting atom's characteristics, have been found by the use of computed and experimental characteristics of interatomic A-O and B-O bonds of solid solutions in binary systems of two types: NaNbO3-A(0.5)(II)NbO(3)(ANb(2)O(6 )) and NaNbO3-A(II)TiO(3), where A(II)=Ni,Cu,Mg,Co,Zn,Mn,Cd,Ca, (NaBi)(0.5) , (AgBi)(0.5), Sr, (KBi)(0.5), Pb or Ba. The correlations between Curie tem perature, T-c, dielectric permittivity, epsilon(33)(T)/epsilon(0), piezocoe fficient, d(31), electromechanical coupling factor, K-p, on one hand and in teratomic bond lengths A-O and B-O on the other hand have been determined.