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Chemical solution deposition as a route to narrow-band gap and room-temperature ferromagnetic perovskite [K0.5Na0.5NbO3]1−x[BaNi0.5Nb0.5O3−δ]x films

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Abstract

[K0.5Na0.5NbO3]1−x[BaNi0.5Nb0.5O3−δ]x (KNBNNO, 0 ≤ x ≤ 0.3) films have been fabricated on different substrates for the first time, using a modified chemical solution deposition method. The microstructure, optical properties, ferromagnetism, and substrate effects of KNBNNO films were assessed, and we found that BaNi0.5Nb0.5O3−δ (BNNO) content was a key factor in determining the properties of the final products. The lower band gap of KNBNNO is due to the band-to-band transition from hybridized Ni 3d and O 2p to Nb 4d states. Moreover, with increasing x from 0 to 0.3, the magnetism transition process of the samples from diamagnetism to ferromagnetism may originate from the competition between ferromagnetic exchange interactions in Ni2+–VO2−–Ni2+ and superexchange interactions in Ni2+–Ni2+. Notably, absorption behaviors in the visible light wave band for KNBNNO films have been realized, which makes it possible to use KNBNNO films for perovskite solar cell applications.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (61474045) and the State Key Basic Research Program of China (2013CB922300).

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Authors and Affiliations

  1. School of Physics and Electronic Engineering, Zhengzhou University of Light Industry, Henan, 450002, China

    Xuezhen Zhai, Shizhuo Wang & Cui Shang

  2. Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of electronics, East China Normal University, Shanghai, 200241, China

    Xuezhen Zhai & Pingxiong Yang

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  1. Xuezhen Zhai
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Correspondence to Xuezhen Zhai.

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Zhai, X., Wang, S., Shang, C. et al. Chemical solution deposition as a route to narrow-band gap and room-temperature ferromagnetic perovskite [K0.5Na0.5NbO3]1−x[BaNi0.5Nb0.5O3−δ]x films. Journal of Materials Research 34, 3627–3635 (2019). https://doi.org/10.1557/jmr.2019.264

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