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Modified phase transition and electrical properties of [Li0.05(Na0.535K0.48)0.95]-(Nb0.94Sb0.06)O3 lead-free piezoelectric ceramic by sintering temperature

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Abstract

Li/Sb-doped (Na,K)NbO3 with a nominal composition of [Li0.05(Na0.535K0.48)0.95](Nb0.94Sb0.06)O3 ceramic was synthesized by normal sintering. The phase structure, microstructure, and electrical properties were investigated with a special emphasis on the influence of the sintering temperature. A polymorphic phase transition (PPT) from orthorhombic to tetragonal symmetry was observed when the sintering temperature was raised from 1040 to 1050 °C, whereby the piezoelectric coefficient d 33 and the electromechanical coupling coefficient k p reached the peak values of 245 pC·N−1 and 41.2%, respectively. The PPT induced by varying the sintering temperature is due to the different volatilization extents of alkali metals and appears to a lower sintering temperature with increasing Li content. The trace modifying of alkali metal content is more effective than doping B site element to enhance the d 33 value.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Xiaokun Zhao, Boping Zhang, Lei Zhao, Lifeng Zhu & Yan Li

  2. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Liqian Cheng

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  1. Xiaokun Zhao
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  2. Boping Zhang
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  3. Lei Zhao
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  4. Lifeng Zhu
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  5. Yan Li
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  6. Liqian Cheng
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Correspondence to Boping Zhang.

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Zhao, X., Zhang, B., Zhao, L. et al. Modified phase transition and electrical properties of [Li0.05(Na0.535K0.48)0.95]-(Nb0.94Sb0.06)O3 lead-free piezoelectric ceramic by sintering temperature. Rare Met. 31, 590–594 (2012). https://doi.org/10.1007/s12598-012-0563-y

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  • DOI: https://doi.org/10.1007/s12598-012-0563-y

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