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Influence of Nonstoichiometry on Extrinsic Electrical Conduction and Microwave Dielectric Loss of BaCo1/3Nb2/3O3 Ceramics

Authors

  • Ming Li,

    1. Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield S1 3JD, UK
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  • Antonio Feteira,

    1. Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield S1 3JD, UK
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    • Present address: School of Chemistry, University of Birmingham, Birmingham B15 2TT, UK

  • Mehdi Mirsaneh,

    1. Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield S1 3JD, UK
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  • Soonil Lee,

    1. Centre for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
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  • Michael T. Lanagan,

    1. Centre for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
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  • Clive A. Randall,

    1. Centre for Dielectric Studies, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
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  • Derek C. Sinclair

    Corresponding author
    1. Ceramics and Composites Laboratory, Department of Engineering Materials, The University of Sheffield, Sheffield S1 3JD, UK
      †Author to whom correspondence should be addressed. e-mail: d.c.sinclair@sheffield.ac.uk
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  • N. Alford—contributing editor

  • This work was financially supported by the EPSRC (EP/G005001/1).

†Author to whom correspondence should be addressed. e-mail: d.c.sinclair@sheffield.ac.uk

Abstract

The microwave (MW) dielectric loss (or quality factor, Q) of BaCo1/3Nb2/3O3 (BCN) ceramics exhibits a strong dependence on sample-processing conditions and is not always consistent with the degree of 1:2 B-site cation ordering. Impedance spectroscopy results reveal that these BCN ceramics exhibit remarkably different electrical properties due to low levels of nonstoichiometry induced during ceramic processing. These compositional changes are difficult to detect by common chemical techniques but can have a significant influence on the electrical properties, and in particular on the extrinsic electrical conduction and Q. The influence of extrinsic conduction induced by ceramic processing should therefore be considered when optimizing Q in MW dielectric ceramics.

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