Evaluation of Alpha Aluminum Phosphate for Advanced Acoustic Wave Devices.

Abstract

Alpha aluminum phosphate (berlinite) has been investigated as a highly piezoelectric material potentially suitable for use in advanced bulk and surface acoustic wave devices. Areas of investigation include: (1) crystal structure, (2) methods of crystal growth, (3) defects in structure, (4) the presence of water impurities, (5) piezoelectric resonators, and (6) the equivalent electrical circuit. Calculations have been carried out for frequency constant, piezoelectric coupling factor, and linear temperature coefficient as functions of orientation for general, doubly rotated plate orientations, and disclose quartz-like properties with coupling factors appreciably larger than quartz. Measurements indicate larger than expected losses, indicative of incorporation of impurities during growth; suggestions for further work are given. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1981
Accession Number
ADA104685

Entities

People

  • Arthur D. Ballato
  • John Gualtieri

Organizations

  • United States Army Communications-Electronics Command

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Acoustic Velocity
  • Birds
  • Circuits
  • Crystal Growth
  • Crystal Structure
  • Crystallization
  • Crystals
  • Equivalent Circuits
  • Measurement
  • Phase Transformations
  • Piezoelectric Crystals
  • Resonance
  • Resonators
  • Signal Processing
  • Surface Acoustic Wave Devices
  • Surface Acoustic Waves
  • Temperature Coefficients

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.