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Acoustic Loss in Langasite and Langanite

Published

Author(s)

Ward L. Johnson, K Sudook, U Satoshi

Abstract

Resonant ultrasonic loss 1/Q in plano-convex unplated Y-cut disks of langasite and langanite were measured as a function of freqeuncy and temperature with the aim of identifying dominant internal mechanisms that will degrade electronic oscillator performance. In both materials, the dependence on temperature is similar to that previously reported for langatate. An anelastic peak appears with maxima in the 200-280 K range at frequencies between 2MHz and 14MHz. The dependence of this peak on temperature and frequency is consistent with a point-defect relaxation. The width is greater than that of a Debye peak., which indicates that the relaxation has a distribution of activation energies. The peak appears at a higher temperature in langasite than in langatate, which may explain the lower room-temperature 1/Q reported thus far in langatate. Additional anelastic peaks appear at elevated temperatures. These effects are superimposed on a component of the loss that increases monotonically with temperature accordig to an approximate Arrhenius expression.
Proceedings Title
Proceedings of the Frequency Control Symposium and PDA Exhibition Jointly with the European Frequency and Time Forum|2003|Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum|IEEE International
Conference Dates
May 4-8, 2003
Conference Title
Frequency Control Symposium

Keywords

acoustic loss, anelasticity, internal friction, langanite, langasite, langatate, relaxation, ultrasonics

Citation

Johnson, W. , Sudook, K. and Satoshi, U. (2004), Acoustic Loss in Langasite and Langanite, Proceedings of the Frequency Control Symposium and PDA Exhibition Jointly with the European Frequency and Time Forum|2003|Frequency Control Symposium and PDA Exhibition Jointly with the 17th European Frequency and Time Forum|IEEE International, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851340 (Accessed May 22, 2024)

Issues

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Created March 1, 2004, Updated February 17, 2017