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Microstructure and transport properties of multiwall carbon nanotube-reinforced barium zirconium titanate ceramics

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Abstract

The influence of multiwall carbon nanotubes (MWCNTs) reinforced on microstructures and their transport properties on pure and cerium-substituted barium zirconium titanate (BZT) ceramics are reported in this study. The MWCNTs were prepared by a low-temperature sonochemical/hydrothermal method using dichloromethane as a carbon source. These MWCNTs were mixed with the as-prepared ceramic powders before heat treatment to obtain a reinforced product. The scanning electron micrographs reveal the successful incorporation of carbon nanotubes in BZT ceramics. The temperature-dependent direct current (dc)-resistivity was less for MWCNT-reinforced ceramics in contrast to that of pure ceramics. The decrease in the dc resistivity was due to the superior electrical behaviour of MWCNTs, which act as a connector between ceramic grains. The Seebeck coefficient of cerium-substituted-BZT improved after reinforcing the MWCNTs.

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Acknowledgements

Thanks for the Department of Science and Technology (DST) New Delhi, India, for granting INSPIRE Fellowship vide No. DST/INSPIRE Fellowship/2011 dated 29 June 2011 to one of the authors (RS). The author (RS) is also thankful to the Vision Group of Science and Technology (VGST), Dept. of IT, BT and S&T, Govt. of Karnataka, Bangalore for sanctioning research grant under CESEM project vide GRD No. 221 dated 24 January 2014.

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Authors and Affiliations

  1. Department of Post Graduate Studies and Research in Materials Science, Gulbarga University, Gulbarga, 585 106, Karnataka, India

    Raghavendra Sagar

  2. Department of Physics, Mangalore Institute of Technology & Engineering, Badaga Mijar, Moodabidre, Dakshina Kannada, 574 225, Karnataka, India

    Raghavendra Sagar

  3. Department of Post Graduate Studies and Research in Applied Electronics, Gulbarga University, Gulbarga, 585 106, Karnataka, India

    R L Raibagkar

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  1. Raghavendra Sagar
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  2. R L Raibagkar
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Correspondence to R L Raibagkar.

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Sagar, R., Raibagkar, R.L. Microstructure and transport properties of multiwall carbon nanotube-reinforced barium zirconium titanate ceramics. Bull Mater Sci 42, 159 (2019). https://doi.org/10.1007/s12034-019-1888-z

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  • DOI: https://doi.org/10.1007/s12034-019-1888-z

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