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Surface Acoustic Wave Properties of La3Ga5SiO14 (LANGASITE) Single Crystals

Theoretical and experimental results have shown the potential usefulness of La3Ga5SiO14 (LGS) for surface acoustic wave (SAW) applications. The existence of orientations with zero-temperature coefficient of delay (TCD) have been calculated by the computer analysis. A simulation of the temperature-compensated Rayleigh SAWs located around both (0°, 140°, 25°) and (15°, 151°, 40.5°) with the Rayleigh SAW velocity v of 2762 and 2860 m/s, coupling coefficient k2 of 0.38 and 0.41%, and power flow angle PFA of 2 and 0°, has been carried out. The Rayleigh SAW velocity v is lower than those of other SAW materials, which enables miniaturization of SAW design.