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- W2607641386 abstract "In this work, Ni-doped SrBi2Nb2O9 (Sr1-xBi2+xNb2-xNixO9-x, or SBNN) ceramics were successfully fabricated by using a solid state reaction method, and their band gaps were determined by UV–vis–NIR absorption spectrum. It is found that Ni doping could significantly reduce the band gap of SrBi2Nb2O9. The Sr0.91Bi2.09Nb1.91Ni0.09O8.91 (SBNN9) ceramics show the lowest band gap of 2.25 eV with a relatively high remanent polarization of 2.5 μC/cm2. The band-gap reducing effect upon Ni doping might be attributed to the formation of the intermediate gap states generated by the Ni2+ cations. Despite oxygen vacancies were unavoidably introduced into the systems after Ni doping, the remanent polarizations of the SBNN ceramics remain almost the same or even larger than the pure SrBi2Nb2O9. Our experimental results are also confirmed by the theoretical analysis based on the first-principle calculations. Novel ferroelectric photovoltaic effects were observed in these SBNN compounds. The switchable photovoltaic outputs induced by electric field were detected along different poling directions in the SBNN9 sample. The SBNN ceramics reported in the present work display narrow band gaps and relatively large polarizations, and show promise for ferroelectric photovoltaic device applications." @default.
- W2607641386 created "2017-05-05" @default.
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- W2607641386 date "2017-11-01" @default.
- W2607641386 modified "2023-10-16" @default.
- W2607641386 title "Ni-doped SrBi2Nb2O9 – Perovskite oxides with reduced band gap and stable ferroelectricity for photovoltaic applications" @default.
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- W2607641386 doi "https://doi.org/10.1016/j.jallcom.2017.04.256" @default.
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