Dielectric investigation of a new TKWB lead free relaxor Original Research Article

A new lead-free tungsten bronze (TKWB) type relaxor derived from Ba1−xSrxNb2O6 and containing Sn was prepared via classical solid state route. A 2.5% Sn:Nb ratio was enough to both induce the relaxor effect and bring the transition temperature close to room temperature. Promising dielectric characteristics were evidenced, in particular when compared to perovskite-type lead-free relaxors. Chemical bonding arguments are used to explain the role of tin in the structure-dielectric properties relationships.