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A rhombohedral structure-properties relation in Pb-free Bi0.5(Na1−x K x )0.5TiO3 ceramics

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Abstract

A structure-properties relation in Bi0.5(Na1−x K x )0.5TiO3 ceramics was investigated for K contents ranging from 0 to 20 mol% substituting for Na in (Bi0.5Na0.5)TiO3 ceramics. A rhombohedral perovskite solid solution was confirmed up to x = 18 mol%. An inverse relation between depolarization temperature (T d ) and piezoelectric coefficient (d 33) was observed in the rhombohedral phase region. As x increased toward the morphotropic phase boundary (MPB), T d was lowered while d 33 was enhanced. Structurally, the rhombohedral lattice distortion (90−α) decreased while the lattice constant (a R ) increased with increasing x. 90−α appeared to be coupled with the compositiondependent variations in T d and d 33; the smaller 90 − α, the lower T d , and the higher d 33.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Y. S. Sung & S. Baik

  2. Department of Convergence Materials Science and Engineering, Changwon National University, Changwon, 641-773, Korea

    G. H. Ryu, J. H. Lee, J. H. Cho, T. K. Song & M. H. Kim

  3. Department of Electrical Engineering, Changwon National University, Changwon, 641-773, Korea

    T. G. Park

  4. Department of Physics, Changwon National University, Changwon, 641-773, Korea

    D. Do & S. S. Kim

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  1. Y. S. Sung
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  2. S. Baik
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  3. G. H. Ryu
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  4. J. H. Lee
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  7. M. H. Kim
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  8. T. G. Park
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  9. D. Do
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  10. S. S. Kim
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Correspondence to M. H. Kim.

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Sung, Y.S., Baik, S., Ryu, G.H. et al. A rhombohedral structure-properties relation in Pb-free Bi0.5(Na1−x K x )0.5TiO3 ceramics. Journal of the Korean Physical Society 60, 284–287 (2012). https://doi.org/10.3938/jkps.60.284

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  • DOI: https://doi.org/10.3938/jkps.60.284

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