Structural and Dielectric Studies of NaNbO_3-A_(0.5)Bi_(0.5)TiO_3 (A-Li,Na,K) Solid Solutions

摘要

Structural and dielectric studies of NaNbO_3 solid solutions with ternary perovskites A_(0.5)Bi_(0.5)TiO_3 (A-Li, Na, K) have shown that while the evolution with x of the temperature dependence of dielectric permittivity, phase transition temperatures and structural parameters for (100-x)NaNbO_3-(x)Na_(0.5)Bi_(0.5)TiO_3 system are typical of the group II NaNbO_3-based solid solutions, the properties of (100-x)NaNbO_3-(x)A_(0.5)Bi_(0.5)TiO_3 (A-Li, K) systems combine the features typical of both group II and group I solid solutions. This difference is explained assuming that the latter two systems are actually ternary solid solutions of the NaNbO_3-Na_(0.5)Bi_(0.5)TiO_3-ANbO_3 (A-Li, K) type.