Abstract
The multiferroic (Bi0.5Na0.5)Ti1-xCoxO3 (xBNTCO) ceramics, where x = 0, 0.02, 0.04, 0.06 and 0.08, have been fabricated by using conventional solid-state sintering method. The effects of doped metal concentrations on microstructure, visible-light response, ferromagnetic and ferroelectric orders have been investigated in detail. X-ray diffraction patterns show that all samples are single rhombohedral phase, but also demonstrate the lattice dilatation phenomenon based on the Williamson-hall analysis theory. The band gaps of samples significantly decrease from 3.0 eV to 1.43 eV with increasing Co concentrations up to 0.08, which results from the appearance of Co 3d electronic orbits between the valence band and the conduction band of BNTO. According to ferroelectric hysteresis loop, the improvement of ferroelectric properties can be attributed to the accurately dominating element content in perovskite compounds. When × = 0.04, the sample with maximum remnant polarization Pr (11.47 μC/cm2) is obtained. Besides, the ferromagnetic order is observed at room temperature (RT), which is explained using an F center exchange theory. These results are significant in perovskite oxides for the further research on optical, ferroelectric and magnetic properties and exhibit significant values in solar energy cells and multiferroic applications.
Published Version
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