Title

Effects of Manganese Doping on the Dielectric Properties of Titanium Dioxide Ceramics

Abstract

Dielectric properties of undoped and manganese (Mn)-doped titanium dioxide (TiO2) ceramics were measured by various test methods including impedance spectroscopy techniques. It was found that direct current conductivity and dielectric loss were effectively suppressed by small amount (∼0.05 mol%) of Mn doping due to generation of possible electron traps. Further increase of Mn content led to formation of oxygen vacancies and increase of dielectric loss. Increased grain-boundary resistivity was observed as Mn-doping concentration increases, presumably due to segregation of Mn solutes at the grain boundaries. Larger difference between the grain and grain-boundary conductivity gave rise to space charge polarization. It was shown that TiO 2 ceramics with optimum amount of Mn-doping concentration possess good dielectric properties that are suitable for energy storage applications.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Office of Naval Research

Keywords and Phrases

Mn Content; Mn-Doping; TiO; Direct Current Conductivity; Energy Storage Applications; Manganese Doping; Space Charge Polarization; Test Method

Library of Congress Subject Headings

Impedance spectroscopy

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2011 Wiley-Blackwell, All rights reserved.


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