The elastic stiffness of langasite at high temperatures and its temperature compensated orientations

Yook Kong Yong, Gobong Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The langasite crystal has the capability of no phase change at temperatures exceeding 600°C for high temperature applications. Since the material properties of langasite were measured usually at 25 0C as the reference temperature they are no longer accurate at high temperature environments. We employ a Lagrangian formulation to investigate the temperature behavior of thickness vibrations of langasite in a wide temperature range from 25°C to 600°C. The analysis only requires the elastic constants and their effective temperature derivatives of elastic constants and thermal expansion coefficients to predict the material constants at any given temperature. Based on the new values of the elastic constants and thermal expansion coefficients, the zero-valued temperature coefficients of frequency are investigated. The presently identified temperature compensated crystal cuts of the thickness-shear modes of langasite at different temperatures were compared with those at reference temperature and also with some cuts found in the literature.

Original languageEnglish (US)
Title of host publication2016 IEEE International Frequency Control Symposium, IFCS 2016 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509020911
DOIs
StatePublished - Aug 16 2016
Event70th IEEE International Frequency Control Symposium, IFCS 2016 - New Orleans, United States
Duration: May 9 2016May 12 2016

Publication series

Name2016 IEEE International Frequency Control Symposium, IFCS 2016 - Proceedings

Other

Other70th IEEE International Frequency Control Symposium, IFCS 2016
Country/TerritoryUnited States
CityNew Orleans
Period5/9/165/12/16

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Instrumentation

Keywords

  • High Temperature compensated cuts
  • Langasite
  • Piezoelectric crystal
  • Thickness-shear modes

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