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Conduction properties of acceptor-doped BaTiO3–Bi(Zn1/2Ti1/2)O3-based ceramics

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Abstract

A series of acceptor-doped ceramics based on the solid solution, (1-x)BaTiO3–xBi(Zn1/2Ti1/2)O3 (BT-BZT), where x = 0.1, 0.2, 0.3, 0.4, were prepared via solid-state synthesis to investigate the effect of do** and BZT content on conduction properties. Impedance spectroscopy measurements showed an increase in conductivity through acceptor do** with Mg on the Ti-site (\({\text{Mg}}_{{{\text{Ti}}}}^{^{\prime\prime}}\)). Ceramics of the composition, 0.80BaTiO3–0.20Bi(Zn1/2Ti1/2)O3 with 3 mol% \({\text{Mg}}_{{{\text{Ti}}}}^{^{\prime\prime}}\), showed the highest conductivity in this study at 1.28 mScm−1 (~ 600 °C), an order of magnitude improvement over the stoichiometric composition. Variable pO2 impedance measurements revealed p-type conductivity in the grain while EMF measurements showed that above ~ 550 °C, ions are the dominant charge carriers (transference number, ti = 0.91 at 735 °C). Similarly, all 3 mol% Mg-doped compositions above x = 0.1 were primarily ionic conductors with transference numbers above ti = 0.79 (735 °C). X-ray diffraction data showed a pseudocubic primary phase for all samples with evidence of additional impurity phases accompanying samples with 3 mol% \({\text{Mg}}_{{{\text{Ti}}}}^{^{\prime\prime}}\) or greater.

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Acknowledgements

This material is based upon work supported by the National Science Foundation under Grant No. DMR-1832803.

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Authors and Affiliations

  1. Materials Science, School of Mechanical, Industrial, and Manufacturing Engineering, Oregon State University, Corvallis, OR, 97331, USA

    Ryan R. McQuade, Pavel Mardilovich & David P. Cann

  2. Materials Science and Engineering, The University of New South Wales, Sydney, Australia

    Nitish Kumar

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  1. Ryan R. McQuade
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  2. Pavel Mardilovich
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  3. Nitish Kumar
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  4. David P. Cann
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Correspondence to Ryan R. McQuade or David P. Cann.

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McQuade, R.R., Mardilovich, P., Kumar, N. et al. Conduction properties of acceptor-doped BaTiO3–Bi(Zn1/2Ti1/2)O3-based ceramics. J Mater Sci 55, 16290–16299 (2020). https://doi.org/10.1007/s10853-020-05175-4

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