LAUSR

Abstract The structure and dielectrics properties of (Bi1.5Zn0.5)(Zn0.5Nb1.5-xRux)O7 (BZNR) pyrochlore ceramics were investigated. The pyrochlore ceramics were prepared by solid-state methods. The XRD results indicate that all ceramics exhibit single cubic pyrochlore structure. The crystal chemistry parameters, bond valence sum AV(O′)[A4] of BZN pyrochlore, slightly decreases with the amount of Ru4+ increasing. The dielectric relaxation behavior of BZNR ceramics was observed. The activation energy involved in the relaxation processes could be approximated by the Arrhenius-type equation. With Ru4+ content increasing, the Ea increased and Tm shifted towards higher temperature. The degree of relaxation behavior was relevant to the reorientation of defect pairs with the substitution of Ru4+ on B sites of α-BZN pyrochlore structure and crystal chemistry parameters.