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Title:Origins of Enhanced Dielectric Properties in Titania-Modified Tantalum Pentoxide Ceramics
Author(s):Brennecka, Geoffrey Lee
Doctoral Committee Chair(s):Payne, David A.
Department / Program:Materials Science and Engineering
Discipline:Materials Science and Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Materials Science
Abstract:Dense and homogeneous specimens enabled the first detailed investigation into the electrical properties of TiO2-modified H-Ta2O 5 ceramics. Specimens containing 8% TiO2 exhibited dielectric constant (K) values of ∼280 at 20°C with tan delta values ∼0.01, but undoped specimens had tan delta values of ∼0.10 and DC resistivity values of <1011O·cm. Hyper-Raman spectroscopy revealed that the ionic polarizability (and thus the intrinsic K) of H-Ta 2O5 ceramics was independent of TiO2 content. Cryogenic electrical measurements suggested that the structural K ≈ 70-80, and showed that enhanced K values resulted from localized carriers related to compensation for deviations from the fully-edge-shared 89Ta2O 5-11TiO2 composition.
Issue Date:2006
Description:268 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006.
Other Identifier(s):(MiAaPQ)AAI3242800
Date Available in IDEALS:2015-09-25
Date Deposited:2006

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