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Formation of nano-Ag/BiFeO3 composite thin film with extraordinary high dielectric and effective ferromagnetic properties

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Abstract

The Ag/BiFeO3 composite thin films were prepared by sol–gel technology on ITO/glass substrate. Most of the Ag+ ions were reduced to form Ag nanoparticles in the thin film. Some Ag+ ions were doped into the BiFeO3 lattice to replace Bi, forming Ag doped BiFeO3. The average size of the Ag nanoparticles is 4–8 nm. The dielectric constant of the BiFeO3 thin film sintered at 550 °C with the molar ratio of Ag/Fe of 0.2 was enhanced to 139, which was nearly twice as high as that of pure BiFeO3. The dielectric loss kept at a low value of 0.15. The composite thin film also showed a typical ferromagnetism with the saturation magnetization of 2.2 emu/cm3. The Ag/BiFeO3 composite thin film showed typical ferromagnetism and high permittivity simultaneously.

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Acknowledgements

This work was supported by the Zhejiang Provincial Natural Science Foundation (grant number LY17E020006) and the Natural Science Foundation of China (grant numbers 51272230 and 50672084). This work was also supported by the Fundamental Research Funds for the Central Universities of China (grant number 2016QNA4009).

Author contributions

SC designed and conducted the experiments, and then finished manuscript. QX analyzed the data and wrote the manuscript partially. XH participated in measuring the properties of the samples. ZW has taken care of the proof-reading of the manuscript and helped to enhance the readability. ZW, NM and PD were involved in the guidance of the experiments designing, the preparation and revision of the manuscript.

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Authors and Affiliations

  1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Shulei Cheng, Qiankun Xu, Xuelin Hao, Zongrong Wang, Ning Ma & Piyi Du

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  1. Shulei Cheng
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  2. Qiankun Xu
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  3. Xuelin Hao
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  4. Zongrong Wang
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  5. Ning Ma
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  6. Piyi Du
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Correspondence to Zongrong Wang or Piyi Du.

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Cheng, S., Xu, Q., Hao, X. et al. Formation of nano-Ag/BiFeO3 composite thin film with extraordinary high dielectric and effective ferromagnetic properties. J Mater Sci: Mater Electron 28, 5652–5662 (2017). https://doi.org/10.1007/s10854-016-6236-0

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  • DOI: https://doi.org/10.1007/s10854-016-6236-0

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