Open AccessSurface acoustic wave temperature properties in alpha-GeO2 crystal
Author(s) -
Р.М. Тазиев
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2131/5/052098
Subject(s) - lithium tantalate , crystal (programming language) , surface acoustic wave , electromechanical coupling coefficient , temperature coefficient , materials science , amplitude , atmospheric temperature range , coupling (piping) , surface wave , optics , condensed matter physics , analytical chemistry (journal) , piezoelectricity , lithium niobate , chemistry , physics , optoelectronics , chromatography , computer science , meteorology , metallurgy , composite material , programming language
In this study, the surface acoustic wave (SAW) temperature properties in flux-grown α-GeO 2 crystal are numerically investigated. It is shown that the SAW velocity temperature change substantially depends only on the temperature coefficient of three elastic constants: C 66 , C 44 and C14 for crystal cuts and wave propagation directions, where SAW has high electromechanical coupling coefficient. The SAW temperature coefficient of delay (TCD) for these crystal cuts are in the range from -40 ppm /°C to -70 ppm /°C. In contrast to alpha-quartz, the surface wave TCD values are not equal to zero in Z-, Y- , and Z- rotated cuts of α-GeO 2 single crystal. Its values are comparable in the magnitude with the surface wave TCD values in lithium tantalate. In the crystal grown from the melt, the interdigital transducer (IDT) conductance has two times larger amplitude than that in hydrothermally grown a-GeO 2 . The leaky acoustic wave excited by IDT on Z+120°-cut and wave propagation direction along the X-axis, has an electromechanical coupling coefficient 5 times less than that for surface wave.