Relaxor behavior of layer structured SrBi1.65La0.35Nb2O9

Abstract

Sr Bi 1.65 La 0.35 Nb 2 O 9 ceramics were prepared by a conventional solid-state reaction method. X-ray diffraction analysis indicated that single phase layered perovskites were obtained. Dielectric response of SrBi1.65La0.35Nb2O9 was found to be characteristic of relaxor ferroelectrics. The dielectric relaxation of SrBi1.65La0.35Nb2O9 was modeled using the Vögel-Fulcher relationship [D. Viehland et al., J. Appl. Phys. 68, 2916 (1990)], and this result suggests that SrBi1.65La0.35Nb2O9 is analogous to a spin glass with thermally activated polarization fluctuations above a static freezing temperature.