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Ergodicity and nonergodicity in La-doped Bi1/2(Na0.82K0.18)1/2TiO3 relaxors

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Abstract

The phase transition of La-doped [Bi1/2(Na0.82K0.18)1/2]TiO3 (BNKT) ceramics was investigated by using high-temperature X-ray diffraction and temperature-dependent dielectric measurements. Undoped BNKT was found to be a nonergodic relaxor, which was evidenced by the presence of a depolarization temperature below which polar nanoregions were frozen. However, La-doped BNKT ceramics are believed to be composites consisting of ergodic and nonergodic relaxors. The results suggest that a nonergodic relaxor with tetragonal symmetry might be distributed in an ergodic relaxor matrix with pseudocubic symmetry.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Ulsan, Ulsan, 680-749, Korea

    Thi Hinh Dinh, Hyoung-Su Han & Jae-Shin Lee

  2. Department of Physics, University of Ulsan, Ulsan, 680-749, Korea

    Chang-Won Ahn & Ill-Won Kim

  3. Department of Metallurgy, University of Kashan, Kashan, Iran

    Mohammad Reza Bafandeh

Authors
  1. Thi Hinh Dinh
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  2. Hyoung-Su Han
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  3. Jae-Shin Lee
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  4. Chang-Won Ahn
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  5. Ill-Won Kim
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  6. Mohammad Reza Bafandeh
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Correspondence to Jae-Shin Lee.

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Dinh, T.H., Han, HS., Lee, JS. et al. Ergodicity and nonergodicity in La-doped Bi1/2(Na0.82K0.18)1/2TiO3 relaxors. Journal of the Korean Physical Society 66, 1077–1081 (2015). https://doi.org/10.3938/jkps.66.1077

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  • DOI: https://doi.org/10.3938/jkps.66.1077

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