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Grain boundary defect compensation in Ti-doped BaFe0.5Nb0.5O3 ceramics

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Abstract

Giant dielectric ceramics Ba(Nb0.5Fe0.5-x Ti x )O3 (BNFT) have been fabricated by a conventional solid-state reaction. According to X-ray diffraction analysis, the crystal structure of these ceramics can be described by the cubic centrosymmetric with Pm-3m space group. The real part (ε’) of dielectric permittivity and dielectric loss (tanδ) of the BNFT ceramics was measured in a frequency range from 40 Hz to 100 MHz at room temperature. The (ε’) of all these samples displays a high value (~6500) and a small frequency-dependence from 1 kHz to 1 MHz. We have established a link between conductivity activation energy and defect compensation at grain boundaries. The Ti4+-doped Ba(Nb0.5Fe0.5)O3 as a donor makes a great influence on the grain boundary behavior, which restricts the migration of oxygen vacancy and depresses dielectric loss factor for Ba(Nb0.5Fe0.5)O3 ceramics.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 11264010, 11564010, 51402196), the Natural Science Foundation of Guangxi (GA139008) and the China Postdoctoral Science Foundation (Grants 2014M552229 and 2015T80915).

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Authors and Affiliations

  1. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Materials Science and Engineering, Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, Guilin University of Technology, Guilin, 541004, People’s Republic of China

    Xiaojun Sun, Jianming Deng, Saisai Liu, Tianxiang Yan, Liang Fang & Laijun Liu

  2. School of Physical Science and Technology and Guangxi Key Laboratory for Relativistic Astrophysics, Guangxi University, Nanning, 530004, People’s Republic of China

    Biaolin Peng

  3. Shanghai Getong Enterprise Co., Ltd., Shanghai, 201206, People’s Republic of China

    Wenhao Jia

  4. Henan LiHeng Building Materials Co., Ltd., Zhengzhou, 450001, People’s Republic of China

    Zaoming Mei

  5. Henan Province Product Quality Supervision and Inspection Center, Zhengzhou, 450004, People’s Republic of China

    Hongbo Su

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  1. Xiaojun Sun
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  2. Jianming Deng
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Correspondence to Biaolin Peng or Laijun Liu.

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Sun, X., Deng, J., Liu, S. et al. Grain boundary defect compensation in Ti-doped BaFe0.5Nb0.5O3 ceramics. Appl. Phys. A 122, 864 (2016). https://doi.org/10.1007/s00339-016-0407-y

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