Abstract
We investigated the densification and electric conductivity in uncommon ultra-fine-grained anatase TiO2 nanoceramics. These materials were prepared by Spark Plasma Sintering (SPS) at 850 °C and exhibited a relative density of 95% and mean grain size of 57 nm. The structural TiO2 anatase phase and microstructural characteristics were determined by XRD and SEM analyses, respectively. A main densification mechanism was proposed based on the grain size–relative density relationship, where an effective pinning effect of nanopores on agglomerates was suggested. Measurements of electric impedance and modulus revealed the influence of SPS conditions on electrical properties. The conductivity relaxation and activation energy in such dense anatase TiO2 nanoceramics were also examined.
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Acknowledgements
The authors are grateful to Dr. D. Seiti (from the Physics Department at the Federal University of São Carlos, UFSCar) for the SPS measurements, and Dra. A.C.M. Rodrigues (from the Vitreous Materials Laboratory, LAMAV, at the Federal University of São Carlos, UFSCar) for providing the IS measurements.
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For the material/financial support, the authors would like to thank the Brazilian institutions and funding agencies: CAPES, CNPq, and FAPESP (Process 2017/19548-7).
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The recognizing individual author contributions to the paper are the following manner: RAR: Investigation, data curation and writing-original draft preparation. FAL: Methodology, writing—reviewing, validation, and editing. JAE: Conceptualization, methodology, validation, and supervision.
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Roca, R.A., Badillo, F.A.L. & Eiras, J.A. Spark plasma sintering and electric conductivity of anatase TiO2 nanoceramics. J Mater Sci: Mater Electron 33, 4375–4387 (2022). https://doi.org/10.1007/s10854-021-07630-7
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DOI: https://doi.org/10.1007/s10854-021-07630-7