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Journal of the American Ceramic Society

Effects of Manganese Doping on the Dielectric Properties of Titanium Dioxide Ceramics

Authors

  • Sheng Chao,

    1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409
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    • *Member, The American Ceramic Society.

  • Fatih Dogan

    Corresponding author
    1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, Missouri 65409
      †Author to whom correspondence should be addressed. e-mail: doganf@mst.edu
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    • **Fellow, The American Ceramic Society.


  • W.-C. Wei—contributing editor

  • This work was financially supported by the Multidisciplinary University Research Initiative (MURI) program sponsored by the Office of Naval Research under the Grant No. N000-14-05-1-0541.

†Author to whom correspondence should be addressed. e-mail: doganf@mst.edu

Abstract

Dielectric properties of undoped and manganese (Mn)-doped titanium dioxide (TiO2) ceramics were measured by various test methods including impedance spectroscopy techniques. It was found that direct current conductivity and dielectric loss were effectively suppressed by small amount (∼0.05 mol%) of Mn doping due to generation of possible electron traps. Further increase of Mn content led to formation of oxygen vacancies and increase of dielectric loss. Increased grain-boundary resistivity was observed as Mn-doping concentration increases, presumably due to segregation of Mn solutes at the grain boundaries. Larger difference between the grain and grain-boundary conductivity gave rise to space charge polarization. It was shown that TiO2 ceramics with optimum amount of Mn-doping concentration possess good dielectric properties that are suitable for energy storage applications.

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