Processing and Additive Effects of ZrO2 on Microstructure and Dielectric Properties of BaTiO3 Ceramics.

Abstract

Dielectric properties and structure of BaTiO3 ceramics have been shown to be significantly influenced by small additions of ZrO2. Scanning Electron Microscopy(SEM) and Transmission Electron Microscopy(TEM) observations revealed enhanced microstructural uniformity and retarded grain growth with ZrO2 addition, depending on sintering temperature (T sub S). For T sub S <1320 C, TEM analysis showed ZrO2 at the grain boundaries as discrete particles in a bandwidth of + or - 50 A. Above 1320 C, diffusion of ZrO2 from the grain boundary region was observed, resulting in increased grain size and a tetragonal structure. X-ray diffraction analysis revealed a pseudo-cubic structure below 1320 C with both twinning and domain structure also suppressed. Ceramics with the pseudo-cubic structures showed a flattened dielectric constant response with temperature and significantly lower dielectric loss.

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Document Details

Document Type
Technical Report
Publication Date
Dec 28, 1987
Accession Number
ADA193126

Entities

People

  • A. K. Maurice
  • L. M. Morgens
  • R. C. Buchanan
  • T. R. Armstrong

Organizations

  • University of Illinois Urbana–Champaign

Tags

DTIC Thesaurus Topics

  • Barium Titanates
  • Capacitance
  • Ceramic Materials
  • Chemistry
  • Dielectric Permittivity
  • Dielectric Properties
  • Diffraction
  • Diffraction Analysis
  • Dissipation Factor
  • High Angles
  • Materials
  • Materials Science
  • Microscopes
  • Phase Transformations
  • Transition Temperature
  • Transitions
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Mathematics or Statistics
  • Nanofabrication and Microfabrication.

Technology Areas

  • Microelectronics