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Description
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 |
Degree: | Ph.D. |
Genre: | Dissertation |
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 |
Type: | Text |
Language: | English |
Description: | 268 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2006. |
URI: | http://hdl.handle.net/2142/82784 |
Other Identifier(s): | (MiAaPQ)AAI3242800 |
Date Available in IDEALS: | 2015-09-25 |
Date Deposited: | 2006 |
This item appears in the following Collection(s)
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Dissertations and Theses - Materials Science and Engineering
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Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois