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A-site effects on the dielectric and the piezoelectric properties of (Na0.50+x K 0.50−x)(Nb0.55Ta0.45)O3 ceramics

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Abstract

(Na0.5+x K0.5−x )(Nb0.55Ta0.45)O3 (NKNT) ceramics prepared by using a solid state process were investigated for various A-site ratios between Na and K at 0 ≤ x ≤ 0.05 to determine the morphotropic phase boundary (MPB). Within the compositional range tested, X-ray diffraction patterns showed NKNT perovskite peaks with no apparent secondary peaks. Scanning electron microscope images showed little difference among microstructures composed of cube-like grains. The piezoelectric coefficient (d 33) was enhanced up to 310 pC/N at x = 0.03 from 262 pC/N at x = 0 and then decreased with further increases in x while the polymorphic phase transition (PPT) temperature (T O−T ) located around room temperature varied little with x. As a result, the increase that occurred in d 33 was mainly due to the MPB effects with the MPB composition of the NKNT ceramics at (Na0.53K0.47).

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Authors and Affiliations

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

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

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

    T. G. Park

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

    D. Do & S. S. Kim

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

    Y. S. Sung & S. Baik

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  1. J. H. Lee
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  2. G. H. Ryu
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  4. T. K. Song
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  8. S. S. Kim
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  9. Y. S. Sung
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Correspondence to Y. S. Sung.

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Lee, J.H., Ryu, G.H., Cho, J.H. et al. A-site effects on the dielectric and the piezoelectric properties of (Na0.50+x K 0.50−x)(Nb0.55Ta0.45)O3 ceramics. Journal of the Korean Physical Society 60, 297–300 (2012). https://doi.org/10.3938/jkps.60.297

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  • DOI: https://doi.org/10.3938/jkps.60.297

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