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Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 lead-free ceramics

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Abstract

Lead-free MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 ceramics have been fabricated by a conventional ceramic technique and their dielectric and piezoelectric properties have been studied. Our results show that a small amount of MnO2 (0.5–1.0 mol%) is enough to improve the densification of the ceramics and decrease the sintering temperature of the ceramics. The co-effects of MnO2 doping and Sb-substitution lead to significant improvements in the ferroelectric and piezoelectric properties. The K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping possesses optimum propeties: d 33 = 187 pC/N, k P = 47.2%, ε r = 980, tanδ = 2.71% and T c = 287 °C. Due to high tetragonal-orthorhombic phase transition temperature (T O-T ~ 150 °C), the K0.5Na0.5Nb0.92Sb0.08O3 ceramic with 0.5 mol%MnO2 doping exhibits a good thermal stability of piezoelectric properties.

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Acknowledgment

This work was supported by the project of Education Department of Sichuan Province (08ZA047), and Science and Technology Bureau of Sichuan Province (09ZQ026-059)

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Authors and Affiliations

  1. College of Chemistry and Materials Science, and Visual Computing and Virtual Reality Key Laboratory of Sichuan Province, Sichuan Normal University, 610066, Chengdu, People’s Republic of China

    Dunmin Lin, Qiaoji Zheng, Chenggang Xu & Chun Yang

  2. Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China

    K. W. Kwok

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  1. Dunmin Lin
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  2. Qiaoji Zheng
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  3. K. W. Kwok
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  4. Chenggang Xu
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  5. Chun Yang
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Correspondence to Dunmin Lin.

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Lin, D., Zheng, Q., Kwok, K.W. et al. Dielectric and piezoelectric properties of MnO2-doped K0.5Na0.5Nb0.92Sb0.08O3 lead-free ceramics. J Mater Sci: Mater Electron 21, 649–655 (2010). https://doi.org/10.1007/s10854-009-9971-7

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  • DOI: https://doi.org/10.1007/s10854-009-9971-7

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