New Temperature Compensated Materials with High Piezoelectric Coupling,

Abstract

The development of new materials with piezoelectric coupling greater than that of quartz will be discussed. A major milestone towards this goal has been the discovery of a physical model for explaining why known materials are temperature compensated. This model has been used to predict new temperature compensated materials. For bulk waves berlinite, AlPO4, has been found to have temperature compensated cuts similar in orientation to the AT and BT cuts of quartz, but with electromechanical coupling coefficients 2.5 times as large. For surface waves, temperature compensated orientations have been calculated to have up to 4 times the electromechanical coupling of ST-cut quartz. Nepheline, (KAlSiO4) (NaAlSi4)3, has positive temperature coefficients for c11 and c66, which indicates that it should have temperature compensated orientations for both bulk and surface acoustic wave applications. Other promising materials will be identified. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 23, 1976
Accession Number
ADA029019

Entities

People

  • Paul H. Carr
  • Robert M. O'connell

Tags

DTIC Thesaurus Topics

  • Acoustic Waves
  • Coefficients
  • Couplings
  • Doppler Effect
  • Frequency
  • Materials
  • Orientation (Direction)
  • Piezoelectric Crystals
  • Surface Acoustic Waves
  • Surface Waves
  • Tectosilicates
  • Temperature Coefficients
  • Waves

Readers

  • Materials Science and Engineering.
  • Thermal Physics or Thermal Science.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems