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Large strain improvement of lead-free (1−x) Bi0.5Na0.42K0.08Zr0.02Ti0.98O3–xBa(Nb0.5Fe0.5)O3 piezoelectric ceramics

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Abstract

In the past decade, great focus has been devoted to the possibility of employing electric fields to induce extremely large strains in Pb-free materials. In the present investigation, lead-free 1−x(Bi0.5Na0.42K0.08)Zr0.02Ti0.98O3–xBa(Nb0.5Fe0.5)O3 or (1−x)BNKZTO–xBNFO ceramics where x = 0, 0.005, 0.010, or 0.015 were prepared via a solid-state reaction. An enhanced strain was achieved by doping a suitable amount of BNFO into BNKZTO, resulting in phase formation and microstructural changes that affect electrical properties, such as dielectric, ferroelectric, and electric field-induced strain (S‒E) behavior. X-ray diffraction analysis revealed both rhombohedral (R) and tetragonal (T) phases in all of the analyzed ceramic samples. The (1–x)BNKZTO-xBNFO binary system ceramics show remarkable strain coefficients at ambient temperature, exhibiting a maximum strain of 0.42% when given an electric field of 60 kV/cm and a normalized strain coefficient (d*33 = Smax/Emax = 700 pm/V).

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The data that support the findings of this study are available upon reasonable request from the authors.

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Acknowledgements

The present study was financially supported by National Research Council of Thailand (NRCT 662505011630), the Research Development Institute (RDI), Department of Metallurgical Technology, Faculty of Technical Education, Rajamangala University of Technology Krungthep (RMUTK), Thailand.

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  1. Department of Metallurgical Technology, Faculty of Technical Education, Rajamangala University of Technology Krungthep, Bangkok, Thailand

    Supalak Manotham & Pichitchai Butnoi

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SM was involved in conceptualization, experiments, formal analysis, and writing–original draft. PB contributed to investigation, characterization, writing–review and editing, supervision.

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Manotham, S., Butnoi, P. Large strain improvement of lead-free (1−x) Bi0.5Na0.42K0.08Zr0.02Ti0.98O3–xBa(Nb0.5Fe0.5)O3 piezoelectric ceramics. J Mater Sci 59, 5330–5344 (2024). https://doi.org/10.1007/s10853-024-09482-y

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