期刊
CERAMICS INTERNATIONAL
卷 45, 期 10, 页码 12806-12813出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2019.03.200
关键词
Oxygen vacancy; Ohmic conduction; Built-in electric field; Multiferroic
资金
- Shaanxi Province Key Research and Development Plan [2018GY-107]
- Project of the National Natural Science Foundation of China [51372145]
- Major Research Projects of the Ministry of Science and Technology of China [2017YFC0210803]
- Graduate Innovation Fund of Shaanxi University of Science and Technology [SUST-A04]
- Shaanxi University of Science and Technology
Thin films of multi-doped bismuth ferrite, Bi0.97-xLaxSr0.03Fe0.94Mn0.04Co0.02O3 (BLxSFMC, x = 0.00-0.18), are synthesized on a fluorine-doped tin oxide (FTO)/glass substrate. The structure and multiferroic properties of the film samples are characterized and tested. The results indicate that on doping, the structure of the BLxSFMC film changes has been changed. The concentrations of both oxygen vacancies and Fe2+ are decreased. The BL0.18SFMC thin film exhibits Ohmic conduction, which reduces the influence of the built-in electric field E(bi )of the space-charge region at the interface between an Au electrode and the BLxSFMC during polarization. The BL0.18SFMC thin film also exhibits enhanced ferroelectric properties than the undoped film, with a higher residual polarization of 188 mu C/cm(2) and a higher squareness ratio of 1.21. Meanwhile, the reduced number of oxygen vacancies also reduces the Fe2+/Fe3+ ratio, thereby enhancing the Dzyaloshinskii-Moriya interaction of Fe-O-Fe bonds, and so the BL0.18SFMC thin film exhibits enhanced ferromagnetism, with a saturation magnetization of M-s approximate to 3.94 emu/cm(3). Thus, multi-ion doping can improve both the ferroelectric and ferromagnetic properties of BLxSFMC thin films.
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