Accession Number:

ADA029019

Title:

New Temperature Compensated Materials with High Piezoelectric Coupling,

Descriptive Note:

Corporate Author:

ROME AIR DEVELOPMENT CENTER HANSCOM AFB MASS DEPUTY FOR ELECTRONIC TECHNOLOGY

Personal Author(s):

Report Date:

1976-06-23

Pagination or Media Count:

4.0

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 NaAlSi43, 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

Subject Categories:

  • Line, Surface and Bulk Acoustic Wave Devices
  • Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE