A2.1 Mechanisms of Anelastic Loss in Langasite at Temperatures from 113 K to 1324 K
- SMSI 2021
2021-05-03 - 2021-05-06
- SMSI 2021 - Sensors and Instrumentation
- A2 Piezoelectric High-Temperature Sensors II (Special Session)
- W. Johnson - National Institute of Standards and Technology, Boulder (USA), Y. Suhak, H. Fritze - Clausthal University of Technology, Goslar (Germany)
- 49 - 50
Synthetic piezoelectric crystals with the structure of langasite (LGS) are being pursued for resonant acoustic sensors that can operate at temperatures exceeding the range of conventional piezoelectric materials. The optimization of these crystals is currently focused primarily on minimization of acoustic loss, which degrades signal strength and resolution of sensors. This paper presents analysis and discussion of two sets of measurements of loss of LGS with a combined temperature range of 113 K to 1324 K. Physical mechanisms for the loss include intrinsic phonon-phonon interactions, multiple point-defect relaxations, piezoelectric/carrier loss, contact loss, and, perhaps, dislocation relaxations.