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Dielectric properties of nanocrystalline TiO<inf>2</inf> prepared using spark plasma sintering

Noh, JH and Hong, KS and Jung, HS and Lee, JK (2006) Dielectric properties of nanocrystalline TiO<inf>2</inf> prepared using spark plasma sintering. Journal of Electroceramics, 17 (2-4). 913 - 917. ISSN 1385-3449

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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. © Springer Science + Business Media, LLC 2006.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Noh, JH
Hong, KS
Jung, HS
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 1 December 2006
Date Type: Publication
Journal or Publication Title: Journal of Electroceramics
Volume: 17
Number: 2-4
Page Range: 913 - 917
DOI or Unique Handle: 10.1007/s10832-006-8574-4
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1385-3449
Date Deposited: 17 Nov 2014 17:57
Last Modified: 22 Jun 2021 20:55
URI: http://d-scholarship.pitt.edu/id/eprint/23492

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