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Structure and piezoelectric properties of lead-free (Na0.52K0.44−x )(Nb0.95−x Sb0.05)O3-xLiTaO3 ceramics

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Abstract

Lead-free (Na0.52K0.48−x )(Nb0.95−x Sb0.05)O3-xLiTaO3 (x = 0.025–0.05) piezoelectric ceramics in which the Sb content is kept constant, have been specially designed and successfully fabricated by a conventional solid state reaction method. The (Na0.52K0.48)(Nb0.95Sb0.05)O3 ceramics can be well sintered after A-site and B-site cations are replaced by Li+ and Ta5+, respectively. A single-phase perovskite structure remains within the studied substitution concentration. An orthorhombic-tetragonal phase transition occurs with gradually increasing the content of Li+ and Ta5+, and was identified in the composition range of 0.0375 < x < 0.0425 where two kinds of ferroelectric phases may coexist and simultaneously a strong compositional dependence of electrical properties was found out. An appropriate content of Sb effectively enhanced the piezoelectric properties of the materials. The optimum overall properties with a piezoelectric constant d 33 of 321 pC/N, a dielectric constant \( \varepsilon_{33}^{T} \) of 1,780, a planar electromechanical coupling coefficient k p of 0.52 and a Curie temperature T c of 315 °C were obtained in the composition with x = 0.0425, indicating the ceramics studied have potentials for replacing lead-containing ceramics for device applications.

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Acknowledgments

This work was financially supported by Key Project of Natural Science Research of Universities in Anhui Province (KJ2009A089), by the Research Fund for the Doctoral Program of Higher Education (No. 200803591018), and by Program for New Century Excellent Talents in University (NCET-08-0766), State Education Ministry.

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Authors and Affiliations

  1. Institute of Electro Ceramics & Devices, School of Materials Science and Engineering, Hefei University of Technology, 230009, Hefei, People’s Republic of China

    Jian Fu, Ruzhong Zuo, Danya Lv, Yi Liu & Yang Wu

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  1. Jian Fu
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  2. Ruzhong Zuo
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  3. Danya Lv
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  4. Yi Liu
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  5. Yang Wu
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Correspondence to Ruzhong Zuo.

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Fu, J., Zuo, R., Lv, D. et al. Structure and piezoelectric properties of lead-free (Na0.52K0.44−x )(Nb0.95−x Sb0.05)O3-xLiTaO3 ceramics. J Mater Sci: Mater Electron 21, 241–245 (2010). https://doi.org/10.1007/s10854-009-9899-y

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  • DOI: https://doi.org/10.1007/s10854-009-9899-y

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