Phase transitions in Na(Nb<sub>0.9</sub>Me<sub>0.1</sub>)O<sub>3 – δ</sub> (Me = Bi, Fe) solid solutions

We investigated the temperature dependence of the permittivity and electrical conductivity of sodium niobate ceramics doped with iron or bismuth in a wide frequency range of the external field. The phase transitions and their characteristics in these solid solutions, as well as the mechanisms of conduction, are determined.