Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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

Published

Author(s)

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

Abstract

Resonant acoustic damping in plano-convex (trapped-mode) langatate (La3Ga5.5Ta00.5014) 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

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 April 22, 2024)
Created October 1, 2002, Updated February 17, 2017