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Colossal and anomalous dielectric behavior in grain-oriented TiO2

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Abstract

In this work, anatase structure TiO2 particles with a preferential grain growth direction of [002] were synthesized by a facile and modified sol–gel approach. The pellets pressed from the TiO2 particles possess colossal dielectric constant (> 7 × 103 at 100 Hz and room temperature). The colossal dielectric constant behavior can be associated with the Maxwell–Wagner relaxation due to the textured grain structure. This approach is simple and provides an avenue to obtain the excellent dielectric properties of ceramics with oriented grains. Contrary to traditional relaxation behavior, an anomalous dielectric behavior was observed above room temperature. This abnormal dielectric behavior was caused by the positive temperature coefficient of resistance effect resulting from humidity response.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51872001 and 51502001) and the Fundamental Research Funds for the Central University (Nos. XDJK2018C003 and lzujbky-2019-23). The authors would like to thank Shiyanjia Lab (www.shiyanjia.com) for the support of TEM test.

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Authors and Affiliations

  1. Laboratory of Dielectric Functional Materials, School of Physics and Material Science, Anhui University, Hefei, 230601, China

    Guojing Wang, Chunchang Wang, Shuting Wang, Rida Ahmed, Jie Sun, Jin Wang & Yufeng Guo

  2. School of Physical Science and Technology, Lanzhou University, Lanzhou, Gansu, 730000, China

    Guojing Wang

  3. Faculty of Materials and Energy, Southwest University, Chongqing, 404100, China

    Guojing Wang

  4. Center of Modern Experimental Technology, Anhui University, Hefei, 230601, China

    Jun Zheng

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  1. Guojing Wang
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Correspondence to Guojing Wang or Chunchang Wang.

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Wang, G., Wang, C., Zheng, J. et al. Colossal and anomalous dielectric behavior in grain-oriented TiO2. J Mater Sci 55, 3940–3950 (2020). https://doi.org/10.1007/s10853-019-04283-0

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