Lead-free relaxor ferroelectric ceramics SrCaBiTiNbO with tunable transition temperature.

Based on nominal components, SrCaBiTiNbO ( x = 0.25, 0.5, 0.75, 1) ceramics were prepared by means of solid-state reaction method. Their transition temperatures T can be experimentally tuned by controlling the atomic ratio of Sr/Ca. All the samples are demonstrated to exhibit relaxor ferroelectric property above room temperature, and T can be controlled effectively by changing the content of Sr ion in A1 site. In addition, the linear relation between T and the x corresponding to Sr ion of A1 site indicates that relaxor ferroelectric with wide-ranging transition temperatures can be obtained, catering for the potential applications. Meanwhile, the dielectric maximum temperature T of relaxation-I obeyed the Vogel-Fulcher law well, and Curie-Weiss fitting confirmed the displacive-type ferroelectric phase transition in these compounds. [ABSTRACT FROM AUTHOR]