Single Crystal Growth of Ferroelectric Tungsten Bronze Compositions for SAW Applications.

Abstract

Ferroelectric tungsten bronze single crystals were grown by the Czochralski technique. The crystals belong to the tetragonal point group 4mm with spontaneous polarization parallel to the 'c' axis. Room temperature dielectric and piezoelectric measurements indicated that the k 15 and d 15 coefficients are significantly larger for these bigger unit cell bronzes as compared to the smaller unit cell bronzes, e.g. SBN, SKN, etc. The results of this study indicated that since the piezoelectric properties of these crystals are better than SBN, it is expected that these composition crystals should show better acoustical properties. As reported earlier, SBN crystals are known to possess excellent acoustical properties and are useful for device application. Hence, this opens up further new interest in this family of crystals for potential use in SAW device applications. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1984
Accession Number
ADA141741

Entities

People

  • R. R. Neurgaonkar

Tags

DTIC Thesaurus Topics

  • Chemistry
  • Crystal Growth
  • Crystal Structure
  • Crystals
  • Curie Temperature
  • Dielectric Permittivity
  • Dielectric Properties
  • Materials
  • Phase Diagrams
  • Phase Transformations
  • Physical Properties
  • Solid Solutions
  • Surface Acoustic Wave Devices
  • Surface Acoustic Waves
  • Temperature Coefficients
  • Transition Temperature
  • Transitions

Fields of Study

  • Materials science

Readers

  • Optical Physics and Photonics.
  • Semiconductor Device Technology
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).