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Dielectric properties of nanocrystalline TiO2 prepared using spark plasma sintering

  • 3. Nanomaterials and synthesis
  • Published:
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Abstract

Ultra fine rutile powders (below 50 nm) were prepared via the sol-gel process and bulk type TiO2 specimens were fabricated using spark plasma sintering (SPS). The TiO2 specimen sintered at a low temperature (720∘C) exhibited a highly relative density (97%) and a nano-sized grain structure (200 nm). Dielectric properties of spark plasma sintered TiO2 specimens including dielectric constants (k) and losses (tan δ) were measured. The TiO2 specimen, obtained by SPS, showed a high dielectric constant (∼780) and a low tan δ (∼0.005), and a relaxation behavior at 1 MHz. After the subsequent annealing process of the TiO2 specimen in O2 flow, the dielectric constants remarkably decreased (k = 100s). These dielectric properties of nanocrystalline TiO2 specimens prepared by SPS were discussed in terms of space charges produced by the reduction of Ti4+ ions and crystallographic orientations of grains.

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Authors and Affiliations

  1. School of Materials Science & Engineering, Seoul National University, Seoul, 151-744, Korea

    Jun Hong Noh & Kug Sun Hong

  2. Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545

    Hyun Suk Jung & Jung-Kun Lee

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  1. Jun Hong Noh
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  2. Kug Sun Hong
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  3. Hyun Suk Jung
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  4. Jung-Kun Lee
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Correspondence to Kug Sun Hong.

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Noh, J.H., Hong, K.S., Jung, H.S. et al. Dielectric properties of nanocrystalline TiO2 prepared using spark plasma sintering. J Electroceram 17, 913–917 (2006). https://doi.org/10.1007/s10832-006-8574-4

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  • DOI: https://doi.org/10.1007/s10832-006-8574-4

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