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Lead-free piezoelectric K0.5Bi0.5TiO3–Bi(Mg0.5Ti0.5)O3 ceramics with depolarisation temperatures up to ~220 °C

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Abstract

The properties of K0.5Bi0.5TiO3-rich ceramic solid solutions in the system (1 − x)K0.5Bi0.5TiO3–xBi(Mg0.5Ti0.5)O3 are reported. The highest values of piezoelectric charge coefficient, d33, and field-induced strains are found in compositions located close to a compositional boundary between single-phase tetragonal and mixed tetragonal + cubic perovskite phases. Maximum d33 values were ~150 pC/N for x = 0.03, with positive strains of ~0.25 %; the x = 0.04 composition had a d33 ~ 133 pC/N and strain of 0.35 % (bipolar electric field, 50 kV/cm, 1 Hz). Depolarisation temperature Td is an important selection criterion for any lead-free piezoelectric for actuator or sensor applications. A Td of ~220 °C for x = 0.03 is ~100 °C higher than for the widely reported Na0.5Bi0.5TiO3–BaTiO3 system, yet d33 values and strains are similar, suggesting the new material is worthy of further attention as a lead-free piezoceramic for elevated temperature applications.

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Acknowledgments

Aurang Zeb wishes to thank the Higher Education Commission of Pakistan and Islamia College Peshawar (Chartered University) for Financial Support. Authors wish to than colleagues me the electroceramics group at Leeds for valuable discussions.

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Authors and Affiliations

  1. Institute for Materials Research, School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

    Aurang Zeb & Steven J. Milne

  2. School of Materials, University of Manchester, Manchester, M13 9PL, UK

    David A. Hall

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  1. Aurang Zeb
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  2. David A. Hall
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  3. Steven J. Milne
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Correspondence to Aurang Zeb.

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Zeb, A., Hall, D.A. & Milne, S.J. Lead-free piezoelectric K0.5Bi0.5TiO3–Bi(Mg0.5Ti0.5)O3 ceramics with depolarisation temperatures up to ~220 °C. J Mater Sci: Mater Electron 26, 9516–9521 (2015). https://doi.org/10.1007/s10854-015-3777-6

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