Title :
Langasite family crystals as promising materials for microacoustic devices at cryogenic temperatures
Author :
Sotnikov, A. ; Smirnova, E. ; Schmidt, H. ; Weihnacht, M. ; Gotze, J. ; Sakharov, S.
Author_Institution :
SAWLab Saxony, IFW Dresden, Dresden, Germany
Abstract :
Using the pulse-echo ultrasonic technique, the velocities of the longitudinal and the shear bulk acoustic waves propagating in five crystallographic directions of LGS and SNGS single crystals were measured in a wide temperature range from 4.2 to 300 K. Elastic constants are derived and treated in the frame of Varshni approach. Some characteristic parameters of the theory are obtained. Strong piezoelectric excitation survives down to liquid helium temperature.
Keywords :
acoustic wave effects; echo; elastic constants; gallium compounds; niobium compounds; piezoelectricity; strontium compounds; ultrasonic applications; LGS single crystals; SLAGS single crystals; Sr3NbGa3Si2O14; Varshni approach; cryogenic temperatures; crystallographic directions; elastic constants; langasite family crystals; longitudinal acoustic waves; microacoustic devices; piezoelectric excitation; pulse-echo ultrasonic technique; shear bulk acoustic waves; temperature 4.2 K to 300 K; Acoustic waves; Crystals; Dielectric measurement; Temperature; Temperature dependence; Temperature measurement; Velocity measurement; Langasite family crystals; cryogenic temperatures; elastic constants;
Conference_Titel :
Frequency Control Symposium & the European Frequency and Time Forum (FCS), 2015 Joint Conference of the IEEE International
Conference_Location :
Denver, CO
Print_ISBN :
978-1-4799-8865-5
DOI :
10.1109/FCS.2015.7138801
