Magnetic and ferroelectric properties of SmBi4Fe0 5Co0 5Ti3015 compounds prepared with different synthesis methods

摘要

The SmBi_4Fe_(0.5)Co_(0.5)Ti_3O_(15) compounds were prepared by the insertion of the SmFe_(0.5)Co_(0.5)O_3 into the Bi_4Ti_3O_(12) host and the conventional solid state reaction method, respectively. X-ray diffraction analysis indicates that the conventional solid state reaction method favors the formation of a single phase four-layer Aurivillius phase of SmBi_4Fe_(0.5)Co_(0.5)Ti_3O_(15) more easily than that prepared by the insertion method. Magnetic and ferroelectric measurements demonstrate that the samples prepared by both methods exhibit coexistence of strong ferromagnetic and weak ferroelectric behaviors at room temperature. Compared with the Bi_5FeTi_3O_(15), the ferromagnetism of the SmBi_4Fe_(0.5)Co_(0.5)Ti_3O_(15) was dramatically enhanced by the partial substitution of Co for Fe and Sm for Bi. The SmBi_4Fe_(0.5)Co_(0.5)Ti_3O_(15) samples exhibit large magnetic responses (2M_r~643 memu/g and coercive fields 2H_c~344 Oe) at room temperature.