Complex Impedance Study of Fine and Coarse Grain TiO2 Ceramics

Titanium dioxide (TiO2) ceramics with various grain sizes were investigated by impedance spectroscopy techniques. Dielectric loss peak identified in coarse grain TiO2 was attributed to space charge polarization occurring at the grain boundaries. Electric modulus representation of the impedance data...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 93; no. 10; pp. 3031 - 3034
Main Authors Chao, Sheng, Petrovsky, Vladimir, Dogan, Fatih
Format Journal Article
LanguageEnglish
Published Malden, USA Blackwell Publishing Inc 01.10.2010
Subjects
Ceramics
Grain boundaries
Grain size
Grains
Impedance
Migration
Representations
Titanium dioxide
Vacancies
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Summary:Titanium dioxide (TiO2) ceramics with various grain sizes were investigated by impedance spectroscopy techniques. Dielectric loss peak identified in coarse grain TiO2 was attributed to space charge polarization occurring at the grain boundaries. Electric modulus representation of the impedance data showed two types of relaxation processes in coarse grain TiO2, whereas only one type was observed in fine grain TiO2. Long‐range migration of oxygen vacancies was found to be the dominant conduction mechanism for fine grain TiO2, while electron hopping between localized states was attributed to dielectric relaxation in coarse grain TiO2.
Bibliography:istex:DE063E4F9F37DF88F0BD42A3F332B5E130919F46
ArticleID:JACE04008
ark:/67375/WNG-SFHCF2MH-1
Fellow, The American Ceramic Society.
This work was financially supported by the Multidisciplinary University Research Initiative (MURI) program sponsored by office of naval research under the Grant No. N000‐14‐05‐1‐0541.
D. C. Lupascu—contributing editor
*
Member, The American Ceramic Society.
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ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2010.04008.x