Abstract
Ba4Sm2FexTi4-2xNb6+xO30 (x = 0, 0.5, 1, 1.5, 2) ceramics were prepared by standard solid-state reaction, and the filled tungsten bronze phase with space group P4bm was confirmed for all compositions. Systematic investigation of the Fe-substitution effects on dielectric, ferroelectric as well as magnetic properties was conducted. As the value of x increased, the Curie temperature (Tc) shifted from 562 K to 411 K, which was consistent with the DSC results. The coercive field (Ec) also decreased monotonously from 90 kV/cm (x = 0) to 20 kV/cm (x = 2), suggesting that the substitution of Fe promoted the ferroelectric domain switching. Compared with Ba4Sm2Ti4Nb6O30 (x = 0), simultaneously enhanced ferroelectric and magnetic properties were realized for x = 1, 1.5 and 2. This work is expected to provide a guide for designing new multiferroic materials.
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