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Phase structure, dielectric, and piezoelectric properties of (K0.94−xNaxLi0.06)(Nb0.94Sb0.06)O3 lead-free ceramics

Authors

  • Lingling Fu,

    1. College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, Chengdu 610066, P. R. China
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  • Dunmin Lin,

    Corresponding author
    1. College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, Chengdu 610066, P. R. China
    • Phone: +86 28 84760802, Fax: +86 28 84767868
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  • Qiaoji Zheng,

    1. College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, Chengdu 610066, P. R. China
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  • Xiaochun Wu,

    1. College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, Chengdu 610066, P. R. China
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  • Chenggang Xu

    1. College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, Chengdu 610066, P. R. China
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Abstract

Lead-free piezoelectric ceramics (K0.94−xNaxLi0.06)(Nb0.94Sb0.06)O3 have been fabricated by a conventional ceramic technique and the effects of K+/Na+ ratio on the structure and piezoelectric properties of the ceramics have been studied. All the ceramics possess a pure perovskite structure. The coexistence of tetragonal and orthorhombic phases is formed at room temperature in the ceramics with 0.45 ≤ x ≤ 0.55. The tetragonal–orthorhombic phase-transition temperature TO–T decreases from 110 to 54 °C with x increasing from 0.35 to 0.55 and then increases from 84 to 144 °C with x further increasing from 0.6 to 0.7, while the Curie temperature TC deceases from 388 to 348 °C with x increasing from 0.35 to 0.70. Because of the coexistence of the two phases near room temperature, the ceramics with x = 0.50 exhibit the optimum piezoelectric properties: d33 = 230 pC/N and kp = 49%. The ceramics possess good time stability of piezoelectric properties.

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