Langasite (LGS) has attracted considerable attention from researchers as a potential substrate material for piezoelectric device applications due to its very good frequency stability and moderately large electromechanical coupling factors for acoustic wave devices. This paper presents a new determination of the second order elastic constants of LGS using acoustic wave velocities measured by a time-of-flight cross-correlation method. Two types of ultrasonic transducers have been used to generate longitudinal and shear bulk waves that propagate through cube-shaped specimens. The specimens and attached transducers are placed inside a temperature chamber to maintain a constant environmental temperature during the measurements. We present a full comparison between the new values determined here and those previously reported.
- Aerospace Division
Measurement of the Second Order Elastic Constants of Langasite Crystals
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Kosinski, JA, Zhang, H, & Bao, Y. "Measurement of the Second Order Elastic Constants of Langasite Crystals." Proceedings of the ASME 2014 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. Volume 1: Development and Characterization of Multifunctional Materials; Modeling, Simulation and Control of Adaptive Systems; Structural Health Monitoring; Keynote Presentation. Newport, Rhode Island, USA. September 8–10, 2014. V001T01A035. ASME. https://doi.org/10.1115/SMASIS2014-7752
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