Effects of Sintering Temperature on the Microstructure and Dielectric Properties of Titanium Dioxide Ceramics

Abstract

Nanostructured (~200 nm grain size) titanium dioxide (TiO2) ceramics were densified at temperature as low as 800 °C by pressureless sintering in a pure oxygen atmosphere. Phase transition and microstructural development of sintered samples were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Dielectric properties including d.c. conductivity, dielectric constant, loss tangent, and dielectric breakdown strength (BDS) were determined for samples sintered at various temperatures. The influence of sintering temperature on the microstructural development, defect chemistry, and dielectric properties of TiO2 is discussed. Nanostructured TiO2 ceramics with high sintering density (>98%) lead to improved dielectric properties; high BDS (~1800 kV/cm), low electrical conductivity (~5 × 10−15 S/cm), high dielectric constant (~130), and low loss tangent (~0.09% at 1 kHz), which is promising for application in high energy density capacitors.

Department(s)

Materials Science and Engineering

Keywords and Phrases

Mechanics; Crystallography; Continuum Mechanics and Mechanics of Materials; Polymer Sciences; Characterization and Evaluation of Materials; Materials Science; General

International Standard Serial Number (ISSN)

0022-2461

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2010 Springer Verlag, All rights reserved.

Publication Date

01 Jul 2010

Link to Full Text

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