Abstract
Dielectric properties of pyrochlores compositions from Bi2O3–Nb2O5–NiO system were analyzed. The dielectric properties are dominated with a low‐temperature relaxation that is typical for Bi‐pyrochlores. A vast pyrochlore homogeneity range that exists in this system allowed to correlate characteristics of the observed relaxations with a compositional variations within the A2O′‐ and B2O6 pyrochlore sublattice. It was possible to make a distinction between different influences of the two sublattices, which can be satisfactorily described by the existing relaxation model for Bi3/2ZnNb3/2O7. A new relaxor‐like room temperature relaxation was found for Bi1.6Ni0.57Nb1.43O6.55.
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