High-temperature electromechanical loss in piezoelectric langasite and catangasite crystals
Yuriy Suhak, Holger Fritze, Andrei Sotnikov, Hagen Schmidt, Ward L. Johnson
Temperature-dependent acoustic loss Q^-1 is studied in partially disordered langasite (LGS, La3Ga5SiO14) and ordered catangasite (CTGS, Ca3TaGa3Si2O14) crystals and compared to previously reported CTGS and langatate (LGT, La3Ga5.5Ta0.5O14) data. Two independent techniques, a contactless tone-burst excitation technique and contacting resonant piezoelectric spectroscopy are used in the study. It is shown that losses in LGS and CTGS are caused by a superposition of several mechanisms, including intrinsic phonon-phonon loss, point-defect relaxations and conductivity-related relaxations. Contributions to the measured Q^-1(T) are determined through fitting to physics-based functions and the extracted fit parameters, including activation energies of the processes, are discussed. Options for loss minimization are presented
, Fritze, H.
, Sotnikov, A.
, Schmidt, H.
and Johnson, W.
High-temperature electromechanical loss in piezoelectric langasite and catangasite crystals, Journal of Applied Physics, [online], https://doi.org/10.1063/5.0058751, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932236
(Accessed December 1, 2021)