Preparation and Properties of High Q Microwave Dielectrics in the (CA, SR, BA) Zirconate System.

Abstract

Effects of powder synthesis and processing parameters on non-stoichiometric CaZrO3 with added SrO and BaO were studied in order to optimize microstructure and microwave dielectric properties. Nitrate precursors of constituent oxides were in aqueous solutions to give the desired composition. The effect of solution pH (1-10) on powder characteristics and gel formation in the system were examined. Optimally high surface areas (31.4 sq.m./g), small particle size (0.05 microns), and uniform, dense microstructure were obtained only for the acidic (ph approx. 1) powders. Ceramic parts with uniform microstructures, high dielectric constants epsilon r = 30 - 35, and high Q (> 4000) were prepared from these powders.

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Document Details

Document Type
Technical Report
Publication Date
Dec 28, 1987
Accession Number
ADA193127

Entities

People

  • B. P. Borglum
  • R. C. Buchanan

Organizations

  • University of Illinois Urbana–Champaign

Tags

DTIC Thesaurus Topics

  • Chemistry
  • Crystal Structure
  • Dielectric Permittivity
  • Dielectric Properties
  • Dielectrics
  • Diffraction
  • Electrical Properties
  • Frequency
  • Grain Growth
  • Grain Size
  • Materials
  • Materials Science
  • Mechanical Properties
  • Particle Size
  • Plastic Explosives
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

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  • Materials Science and Engineering.
  • Thin Film Deposition Science.