Temperature Compensated Piezoelectric Materials

Abstract

In order to search for new temperature compensated materials for surface acoustic wave (SAW) devices with low ultrasonic attenuation and high electromechanical coupling, the following experimental and theoretical investigations were carried out: Extensive crystal growth investigations were carried out for beta-LiAlSiO4 (beta-eucryptite), Pb2KNb5O15, Li2SiO3, Ba2Si2TiO8, Ba2Ge2TiO8 and Bi2MoO6, using Czochralski, Bridgman or flux-pulling methods. The single crystal elastic constants, the piezoelectric constants, and the temperature derivatives of these quantities have been measured by means of the ultrasonic pulse superposition method for beta-LiAlSiO4, alpha-AlPO4 (alpha- berlinite), and Pb2KNb5O15. The direction dependence of the resonance frequency and of the ultrasonic delay time, of their temperature coefficients, and of the electromechanical coupling factor was investigated. The capability for measuring piezoelectric constants by means of x-rays has been developed.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1977
Accession Number
ADA044237

Entities

People

  • G. R. Barsch
  • K. E. Spear

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Acoustic Waves
  • Crystal Structure
  • Crystals
  • Curie Temperature
  • Measurement
  • Phase Transformations
  • Physical Properties
  • Piezoceramics
  • Piezoelectric Crystals
  • Piezoelectric Effect
  • Piezoelectric Materials
  • Platinum
  • Signal Processing
  • Surface Acoustic Wave Devices
  • Surface Acoustic Waves
  • Temperature Gradients
  • Transition Temperature

Fields of Study

  • Materials science
  • Physics

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems