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Effects of Li/M (M = Al, Ga, In, and Er) co-doping on the electrical properties of BiFeO3–BaTiO3 ceramics

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Abstract

The defect structures and electrical properties of 0.75BiFeO3–0.25BaTiO3 ceramics have been modified using Li/M dopants (M = Al, Ga, In, and Er). The effects of Li/M dopants with various ionic radii and electronegativities on the crystal structure, dielectric properties, ferroelectricity, leakage, and insulation behaviors of the ceramics have been investigated. The doped ceramics displayed a typical perovskite structure with a dominant rhombohedral phase, but the impurities BaFe0.24Fe0.76O2.88 emerged and increased in concentration as doping content x increased. As x increased, the dielectric loss reduced and the ferroelectricity improved noticeably. At x = 6 mol%, leakage current and resistivity studies indicated that the ceramics showed enhanced insulating qualities, particularly high resistivity of ~ 1011 Ω cm was recorded in Li/Er-doped samples. The reduced oxygen vacancies are responsible for these results, which were evaluated by defect chemistry and validated by XPS analysis.

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Funding

This work was financially supported by the National Natural Science Youth Foundation of China (Grant No. 51702069).

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Authors and Affiliations

  1. School of Science, Harbin University of Science and Technology, Harbin, 150080, China

    Dan Xu, Hong Zhao, Taolin Yu & Xiaoyang Duan

  2. Higher Educational Key Laboratory for Measuring & Control Technology and Instrumentations of Heilongjiang Province, Harbin University of Science and Technology, Harbin, 150080, China

    Wenjie Zhao

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  1. Dan Xu
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  2. Hong Zhao
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  3. Taolin Yu
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Contributions

DX and WZ contributed to the study conception and design. Material preparation, data collection, and analysis were performed by HZ, TY, and XD. The first draft of the manuscript was written by DX and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Dan Xu or Wenjie Zhao.

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Xu, D., Zhao, H., Yu, T. et al. Effects of Li/M (M = Al, Ga, In, and Er) co-doping on the electrical properties of BiFeO3–BaTiO3 ceramics. J Mater Sci: Mater Electron 33, 22736–22750 (2022). https://doi.org/10.1007/s10854-022-09040-9

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