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Improved Electrical Properties of Layer Structured La2Ti1.96V0.04O7 Ceramics

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Abstract

La2Ti1.96V0.04O7 (LTVO) ceramics with Ti4+ ions partially substituted by V5+ ions at B sites show excellent electrical properties. The dopant V5+ ions do not result in collapse of the cell layered structure, but they lead to the enhanced distortions of BO6 oxygen octahedrons. Impedance spectroscopy reveals that a certain number of defects are formed due to the substitution of Ti4+ ions by V5+ ions. Meanwhile, the concentration of oxygen vacancies is decreased compared to pure La2Ti2O7 (LTO) ceramics. The direct current resistivity of LTVO ceramics obtained from alternating current (AC) impedance fitting at 600°C is 1.3 × 106 Ω cm, which is more than five times of that of the pure LTO at the same temperature (2.2 × 105 Ω cm). The substitution of Ti4+ ions by V5+ ions greatly enhances the piezoelectric coefficient, d33 = 4.8 pC/N. Therefore, the doping of V5+ ions in the B sites of LTO ceramics should be a good choice for enhancing their piezoelectric properties and resistivity at high temperature regimes.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51932010), Sichuan Science and Technology Program (2018G20140) and the Fundamental Research Funds for Central Universities. I myself will also thank my friends Wenju Guan and Hanjiang Zou for waking me up every morning for months, so that I can complete this article successfully. This work is also supported by the China Scholarship Fund (201906240248).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Sichuan University, Chengdu, 610064, China

    Yueyi Li, Laiming Jiang, Wenwu Wang, Zhifeng Jiao, Dayun Liang, Qiang Chen & Jianguo Zhu

  2. Department of Materials Science and Engineering, University of California at Irvine, Irvine, CA, 92697, USA

    Tom Lee, Xingxu Yan & Xiaoqing Pan

  3. Department of Physics and Astronomy, University of California at Irvine, Irvine, CA, 92697, USA

    Xiaoqing Pan

  4. Irvine Materials Research Institute, University of California at Irvine, Irvine, CA, 92697, USA

    Mingjie Xu & Xiaoqing Pan

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  1. Yueyi Li
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Li, Y., Lee, T., Jiang, L. et al. Improved Electrical Properties of Layer Structured La2Ti1.96V0.04O7 Ceramics. J. Electron. Mater. 49, 2584–2595 (2020). https://doi.org/10.1007/s11664-020-07945-x

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  • DOI: https://doi.org/10.1007/s11664-020-07945-x

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