Dielectric properties of nanocrystalline TiO2 prepared using spark plasma sintering

Jun Hong Noh; Kug Sun Hong; Hyun Suk Jung; Jung Kun Lee

doi:10.1007/s10832-006-8574-4

Dielectric properties of nanocrystalline TiO₂ prepared using spark plasma sintering

Jun Hong Noh, Kug Sun Hong, Hyun Suk Jung, Jung Kun Lee

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

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.

Original language	English
Pages (from-to)	913-917
Number of pages	5
Journal	Journal of Electroceramics
Volume	17
Issue number	2-4
DOIs	https://doi.org/10.1007/s10832-006-8574-4
Publication status	Published - 2006 Dec
Externally published	Yes

Bibliographical note

Funding Information:
Acknowledgments This research was supported by a grant from the Core Technology Development Program funded by the Ministry of Commerce, Industry and Energy (MOCIE),Republic of Korea.

Keywords

Dielectric property
Nanocrystalline
Reduction
Spark plasma sintering
TiO

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Mechanics of Materials
Materials Chemistry
Electrical and Electronic Engineering

Access to Document

10.1007/s10832-006-8574-4

Cite this

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title = "Dielectric properties of nanocrystalline TiO2 prepared using spark plasma sintering",

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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author = "Noh, {Jun Hong} and Hong, {Kug Sun} and Jung, {Hyun Suk} and Lee, {Jung Kun}",

note = "Funding Information: Acknowledgments This research was supported by a grant from the Core Technology Development Program funded by the Ministry of Commerce, Industry and Energy (MOCIE),Republic of Korea.",

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AU - Noh, Jun Hong

AU - Hong, Kug Sun

AU - Jung, Hyun Suk

AU - Lee, Jung Kun

N1 - Funding Information: Acknowledgments This research was supported by a grant from the Core Technology Development Program funded by the Ministry of Commerce, Industry and Energy (MOCIE),Republic of Korea.

PY - 2006/12

Y1 - 2006/12

N2 - 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.

AB - 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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