Improved Non-Linear Dielectrics for Electronic Tuning.

Abstract

NG INFLUENCE OF THE GRAIN SIZE OF BARIUM STRONTIUM TITANATE ON THE PERMITTIVITY RATIO, THE VARIATION OF PERMITTIVITY WITH SUPERIMPOSED DC BIAS, IS PRESENTED AS A FUNCTION OF TEMPERATURE. A 10-fold decrease in permittivity with 80 v/mil dc bias was obtained at the Curie temperature of a ceramic with coarse grains. The mechanisms responsible for the field dependent change in permittivity, namely a field induced paraelectric to ferroelectric transition and a domain alignment process, are re-examined in the light of recent findings stressing the influence of microstructure. The frequency response of dissipation factor is also included along with the proposed mechanisms that account for the observed behavior. Satisfactory performance of the non-linear dielectrics in tuning devices is possible within a constant temperature environment and a frequency range of 3 to 30 MHz. (Author)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1973
Accession Number
AD0765417

Entities

People

  • Howard Wichansky

Organizations

  • United States Army Communications-Electronics Command

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Alkaline Earth Metals
  • Barium
  • Barium Strontium Titanates
  • Curie Temperature
  • Dielectrics
  • Dissipation
  • Dissipation Factor
  • Elements
  • Environment
  • Frequency
  • Frequency Response
  • Grain Size
  • Metals
  • Strontium
  • Titanates
  • Tuning Devices

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Systems Analysis and Design

Technology Areas

  • Microelectronics