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The lowered dielectric loss tangent and grain boundary effects in fluorine-doped calcium copper titanate ceramics

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Abstract

The effects of F− concentration on the dielectric properties and electric modulus of CaCu3Ti4O12−x F x ceramics (0 ≦ x ≦ 0.8) were investigated in detail. Proper amount of F− substitution in CaCu3Ti4O12−x F x ceramics reduced the dielectric loss tangent. When x = 0.8, the dielectric loss tangent of CaCu3Ti4O12−x F x ceramic was about 0.05 (at 5 kHz), which was the lowest value and exhibited the highest grain boundary resistance (1.18 MΩ); meanwhile, the samples retained a relatively high dielectric constant above 7000 over a wide frequency range of 100 Hz to 1 MHz. The grain size was reduced as the F− doping concentration increased, which enhanced grain boundary resistance, and the decreased dielectric loss tangent was attributed to the increased grain boundary resistance. With the increase of F− concentration, the dielectric relaxation behaviors correlated with the grain boundary effects were significantly enhanced. The thermal-activated Schottky-type barrier was formed in the grain boundaries, and CaCu3Ti4O12−x F x ceramics had a nonlinear-Ohmic property.

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Acknowledgement

The authors acknowledge the financial support by the National Key Research and Development Plan (No. 2016YFA0300801), and by the development programmer of China (863 Program) (Grant No. 2015AA034102).

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Authors and Affiliations

  1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Xin Huang, Huaiwu Zhang, Yuanming Lai & Jie Li

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  1. Xin Huang
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  2. Huaiwu Zhang
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  3. Yuanming Lai
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  4. Jie Li
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Correspondence to Xin Huang or Huaiwu Zhang.

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Huang, X., Zhang, H., Lai, Y. et al. The lowered dielectric loss tangent and grain boundary effects in fluorine-doped calcium copper titanate ceramics. Appl. Phys. A 123, 317 (2017). https://doi.org/10.1007/s00339-017-0947-9

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