Acoustic Damping in Langatate as a Function of Temperature, Frequency, and Mechanical Contact

Published

October 1, 2002

Author(s)

Ward L. Johnson, Sudook A. Kim, Damian S. Lauria, R C. Smyth

Abstract

Resonant acoustic damping in plano-convex (trapped-mode) langatate (La₃Ga_5.5Ta0_0.50₁₄) discs was measured at frequencies from 2 MHz to 18 MHz and temperatures from 130 K to 450 K. A broad anelastic relaxation peak was observed in the temperature dependence of the damping, and this peak extends into the ambient temperature range. Measurements and theoretical calculationsof the vibrational trapping efficiency indicate that external damping was not significant for overtones above the fundamental. For some modes, relatively narrow peaks in the temperature dependence of the loss were observed, and these are attributed to coupling with other modes.

Proceedings Title

Ultrasonics Symposium | | 2002 IEEE Ultrasonics Symposium | IEEE

Volume

2002

Issue

1

Conference Dates

October 1, 2002

Conference Location

Munich, GE

Conference Title

IEEE Ultrasonics Symposium

Pub Type

Conferences

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Keywords

acoustic, anelasticity, internal friction, langatate, relaxation, resonance

Citation

Johnson, W. , Kim, S. , Lauria, D. and Smyth, R. (2002), Acoustic Damping in Langatate as a Function of Temperature, Frequency, and Mechanical Contact, Ultrasonics Symposium | | 2002 IEEE Ultrasonics Symposium | IEEE, Munich, GE, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851324 (Accessed December 6, 2024)