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Flash sintering preparation and colossal dielectric origin of (Al0.5Ta0.5)0.05Ti0.95O2 ceramics

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Abstract

In this paper, (Al, Ta) co-doped TiO2 (ATTO) ceramics were successfully prepared by flash sintering method under different electric fields (450–650 V/cm). The effects of electric field on flash sintering behavior, phase structure, microstructure, dielectric properties and varistor properties of ATTO ceramics were systematically studied. The results showed that all flash sintering ATTO ceramics were single rutile structure. With increasing electric field, grain size gradually increased. When the electric field was 550 V/cm, ATTO ceramic had the best comprehensive performance with dielectric constant of approximately 1.7 × 104, dielectric loss of about 0.5 at 1 kHz, and nonlinear coefficient of 3.5. X-ray photoelectron spectroscopy (XPS) and Impedance spectra (IS) results showed that the origin of good dielectric property was attributed to the internal barrier layer capacitance effect. Therefore, this work is not only of great significance to the further study of co-doped TiO2 colossal dielectric ceramics, but also offers an excellent method for the preparation of capacitive varistor dual-function ceramics.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Grant Nos. 52072004, 51802003, and 51572113) and Development Program of Anhui Province (No. 2022i01020008) and State Key Laboratory of Advanced Materials and Electronic Components (No. FHR-JS-202011006).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan, 243002, China

    Zhentao Wang, Mengyang Shi, Juan Liu, Jiamao Li & Dong Xu

  2. School of Materials Science and Engineering, Anhui Polytechnic University, Wuhu, 241000, China

    Zhentao Wang & Dong Xu

  3. China Innovation Academy of Intelligent Equipment Co., Ltd., Ningbo, 315700, China

    Lei Zhang & Zhan Cheng

  4. Zhengzhou Research Institute of Mechanical Engineering Co., Ltd., Zhengzhou, 450001, China

    Jian Qin & Yongtao Jiu

  5. State Key Laboratory of Advanced Materials and Electronic Components, Zhaoqing, 526000, China

    Bin Tang

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  1. Zhentao Wang
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  2. Mengyang Shi
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  3. Juan Liu
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  4. Jiamao Li
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Contributions

ZW: conceptualization, methodology, investigation, preparation, experiment, writing. MS: draft visualization, experiment, analyzing writing. JL: supervision, data curation. JL: supervision. LZ, ZC, JQ, YJ: investigation. BT: conceptualization. DX: guiding. All authors read the paper and commented on the text.

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Correspondence to Dong Xu.

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Wang, Z., Shi, M., Liu, J. et al. Flash sintering preparation and colossal dielectric origin of (Al0.5Ta0.5)0.05Ti0.95O2 ceramics. J Mater Sci: Mater Electron 33, 15802–15813 (2022). https://doi.org/10.1007/s10854-022-08482-5

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