Preparation and Stoichiometry Effects on Microstructure and Properties of High Purity BaTiO3.

Abstract

Effects of stoichiometry, precursor origin and powder synthesis method on sintered microstructure and dielectric properties of commercial high purity BaTi03 were examined, with a view to potential interchangeability. Powders used were prepared by conventional calcination, by precipitation from oxalate precursors and by hydrothermal synthesis. Stoichometric (Ba:Ti) ratios wre in the range 0.987 to 1.002. Characterization by SEM, x-ray diffraction, BET surface area and particle size analysis revealed significant differences, particularly in agglomerate structure, resulting in different microstructural development. Stoichiometric effects on microstructure were also significant if predictable. However, the combined effects of agglomerate structure and stoichiometry on measured dielectric properties could not be predicted, hence interchangeability of powders could not be achieved.

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Document Details

Document Type
Technical Report
Publication Date
Mar 27, 1986
Accession Number
ADA167263

Entities

People

  • A. K. Maurice
  • R. C. Buchanan

Organizations

  • University of Illinois Urbana–Champaign

Tags

DTIC Thesaurus Topics

  • Barium Titanates
  • Ceramic Materials
  • Chemical Analysis
  • Chemical Synthesis
  • Chemistry
  • Curie Temperature
  • Dielectric Permittivity
  • Dielectric Properties
  • Dielectrics
  • Dissipation Factor
  • Electron Microscopy
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Particle Size

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.