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Fabrication of Lead-free (K0.5Na0.5)1−xAg x NbO3 Ferroelectric Ceramics and Their Dielectric Properties

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Abstract

In this study, lead-free (K0.5Na0.5)1−xAg x NbO3 (x = 0.00, 0.10, 0.15, 0.20, 0.25, and 0.30) ferroelectric ceramics were fabricated using solid-state synthesis without A-site and B-site manufacturing step. The (K0.5Na0.5)1−xAg x NbO3 ceramics were sintered at 1110 °C for 4 h after calcination at 800 °C for 3 h. The sintered sample was dense, and the grain size was 1.02 ~ 7.8 μm. For x ≤ 0.2, the sintered ceramic samples had a single perovskite structure. The temperature dependence of the dielectric constant in the (K0.5Na0.5)1−xAg x NbO3 was measured at 1 kHz using an LCR meter. The high dielectric constant properties could be obtained in (K0.5Na0.5)1−xAg x NbO3 ceramics. The orthorhombic-to-tetragonal phase transition temperature and ferroelectric Curie temperature decreased linearly with increasing mole fraction of the Ag content. The Curie temperature shifted from 393 °C for (K0.5Na0.5)NbO3 ceramics to 317 °C for (K0.5Na0.5)0.7Ag0.3NbO3 ceramics. The maximum dielectric constant was 8930 at 330 °C in the (K0.5Na0.5)0.8Ag0.2NbO3 ceramics.

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Authors and Affiliations

  1. Department of Physics, Dankook University, Cheonan, 31116, Korea

    Jaeduk Byun & June Won Hyun

  2. Center for Innovative Engineering Education, Dankook University, Yongin, 16890, Korea

    Yeon Jung Kim

  3. Department of Materials Science and Engineering, Budapest University of Technology and Economics, Budapest, 1111, Hungary

    Kristóf Bobor

Authors
  1. Jaeduk Byun
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  2. June Won Hyun
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  3. Yeon Jung Kim
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  4. Kristóf Bobor
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Correspondence to June Won Hyun.

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Byun, J., Hyun, J.W., Kim, Y.J. et al. Fabrication of Lead-free (K0.5Na0.5)1−xAg x NbO3 Ferroelectric Ceramics and Their Dielectric Properties. J. Korean Phys. Soc. 72, 726–730 (2018). https://doi.org/10.3938/jkps.72.726

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  • DOI: https://doi.org/10.3938/jkps.72.726

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