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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
Journal of Applied Physics


acoustic loss, catangasite, CTGS, conductivity, high temperatures, langasite, LGS, langatate, LGT, piezoelectric sensors


Suhak, Y. , Fritze, H. , Sotnikov, A. , Schmidt, H. and Johnson, W. (2021), High-temperature electromechanical loss in piezoelectric langasite and catangasite crystals, Journal of Applied Physics, [online],, (Accessed July 14, 2024)


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Created August 23, 2021, Updated November 29, 2022