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Investigation on recent quartz-like materials for SAW applications
M P Da Cunha1, S De Azevedo Fagundes
1Dept. of Electr. and Comput. Eng., Central Florida Univ., Orlando, FL.
Summary
New trigonal materials like langasite (LGS), gallium phosphate (GaPO4), and langanite (LGN) show promise for surface acoustic wave (SAW) devices, offering low temperature coefficients of delay and high electromechanical coupling. These SAW materials could enable advanced frequency control applications.
Area of Science:
- Materials Science
- Acoustoelectronics
- Solid State Physics
Background:
- Recent advancements in growing trigonal system class 32 quartz-like materials.
- Potential for these materials in bulk acoustic wave (BAW) and surface acoustic wave (SAW) frequency control applications.
Purpose of the Study:
- Investigate SAW-optimized orientations for langasite (LGS), gallium phosphate (GaPO4), and langanite (LGN).
- Characterize temperature coefficient of delay (TCD), electromechanical coupling coefficient (K(2)), and power flow angle (PFA).
Main Methods:
- Exploration of singly and doubly rotated cuts for LGS, GaPO4, and LGN.
- Calculation and contour plotting of TCD, K(2), and PFA.
- Analysis of material constant influence on SAW properties.
Main Results:
- Identified promising orientation regions with low TCD (<10 ppm/°C) and PFA.
- Observed K(2) values significantly higher than quartz ST-X, enabling larger bandwidth devices.
- Phase velocities are 13-26% lower than quartz ST-X, allowing for smaller device dimensions.
Conclusions:
- LGS, GaPO4, and LGN are highly suitable for SAW applications due to their favorable TCD, K(2), and phase velocity characteristics.
- These materials offer competitive or superior performance compared to established materials like quartz ST-X.
- Potential for miniaturized and high-performance SAW devices in various electronic applications.
