TY - JOUR
T1 - Modified microstructure, magnetic and ferroelectric properties in narrow bandgap Bi0.5Na0.5Ti1-xCoxO3 ceramics
AU - Zheng, Dongliang
AU - Deng, Hongmei
AU - Si, Shufang
AU - Yu, Jiejin
AU - Yang, Pingxiong
AU - Chu, Junhao
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/3
Y1 - 2022/3
N2 - 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.
AB - 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.
KW - Ferroelectric properties
KW - Optical properties
KW - Perovskites
KW - Solid state reaction
UR - https://www.scopus.com/pages/publications/85121676587
U2 - 10.1016/j.mseb.2021.115590
DO - 10.1016/j.mseb.2021.115590
M3 - 文章
AN - SCOPUS:85121676587
SN - 0921-5107
VL - 277
JO - Materials Science and Engineering: B
JF - Materials Science and Engineering: B
M1 - 115590
ER -