Origins of Enhanced Dielectric Properties in Titania-Modified Tantalum Pentoxide Ceramics

Brennecka, Geoffrey Lee

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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
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