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Lead-free piezoelectric ceramics based on (1 − x)BNKLLT–xBCTZ binary solid solutions synthesized by the solid-state combustion technique

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Abstract

The aim of this work is to improve the electrical properties of BNKLLT ceramics with the addition of BCTZ. New binary (1 − x)BNKLLT-xBCTZ lead-free piezoelectric ceramics with different x contents between 0 and 0.10 (step 0.02) were fabricated by the solid-state combustion technique, where glycine was used as a fuel. The influences of x concentration on the phase evolution, morphology, and electrical behavior were investigated. The phase formation exhibited a coexistence of rhombohedral and tetragonal phases in all samples. With the increasing x content, the phase formation was dominated by a higher tetragonality. The average gain size continuously reduced from 1.52 to 0.96 µm when x content was increased. The maximum dielectric temperature (T SA) of these ceramics decreased with the increasing x content. The ferroelectric properties were further weakened with the increasing x content. The MPB region was obtained at x content of around 0.04 producing this sample and showed the highest dielectric constants (ε r = 2720 and ε SA = 6110) and an excellent piezoelectric constant (d 33 = 295 pC/N).

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Acknowledgements

This work was supported by the Higher Education Research Promotion and National Research University project of Thailand, Office of the Higher Education Commission. The authors wish to thank the Department of Physics, Faculty of Science, Naresuan University for the supporting facilities. Thanks are also due to Mr. Don Hindle for his help in editing the manuscript.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand

    Chittakorn Kornphom & Theerachai Bongkarn

  2. Research Center for Academic Excellence in Applied Physics, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand

    Chittakorn Kornphom & Theerachai Bongkarn

  3. Department of Chemistry, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Ladkrabang, Bangkok, 10520, Thailand

    Naratip Vittayakorn

  4. Research Center for Academic Excellence in Petroleum, Petrochemicals and Advanced Materials, Faculty of Science, Naresuan University, Phitsanulok, 65000, Thailand

    Theerachai Bongkarn

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  1. Chittakorn Kornphom
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  2. Naratip Vittayakorn
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  3. Theerachai Bongkarn
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Correspondence to Theerachai Bongkarn.

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Kornphom, C., Vittayakorn, N. & Bongkarn, T. Lead-free piezoelectric ceramics based on (1 − x)BNKLLT–xBCTZ binary solid solutions synthesized by the solid-state combustion technique. J Mater Sci 51, 4142–4149 (2016). https://doi.org/10.1007/s10853-016-9737-6

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