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A novel lead-free tungsten bronze type ceramic Sr5BiTi3Nb7O30, was preparedby a conventional solid-state reaction route. The room-temperature crystalstructure shows an average structure with centro-symmetric space group P4/mbmidentified by synchrotron XRD. Temperature dependence of dielectricpermittivity indicates that Sr5BiTi3Nb7O30 is a ferroelectric relaxor with Tmnear 260 K. The ceramic displays stronger frequency dispersion and lowerphase-transition temperature compared with Sr6Ti2Nb8O30. A macroscopic andphenomenological statistical model was employed to describe the temperaturedependence of their dielectric responses. The calculated size of polarnanoregions (PNRs) of Sr5BiTi3Nb7O30 compared with Sr6Ti2Nb8O30 implies thatthe stronger diffusion phase transition for the former is related to thedisorder emerged in both A and B sites. The smaller PNRs can be activated atlower temperature but have smaller electrical dipole moment. This is the originof relaxor behavior of Sr5BiTi3Nb7O30 with lower Tm and dielectricpermittivity. The PNRs is related to a local structure with a polar space groupP4bm, which contributes to the dielectric frequency dispersion of relaxorbehavior. This work opens up a promising feasible route to the development ofrelaxor ferroelectrics in tungsten bronze type oxides.

Structure and relaxor ferroelectric behavior of novel tungsten bronze type ceramic, Sr5BiTi3Nb7O30