LGS Piezoelectric Crystals
Langastie crystal (La3Ga5SiO14, LGS), belonging to the space group P321, point group 32, has been reported to be promising new piezoelectric materials for fabrication of surface acoustic wave (SAW), bulk acoustic wave (BAW) devices and sensors(pressure sensor, acceleration sensor, QCM,etc.).
Langastie crystal (La3Ga5SiO14, LGS), belonging to the space group P321, point group 32, has been reported to be promising new piezoelectric materials for fabrication of surface acoustic wave (SAW), bulk acoustic wave (BAW) devices and sensors(pressure sensor, acceleration sensor, QCM,etc.). It is reported that devices made of langasite crystal could be used at a high temperature up to 900°C because of its high thermal stability.
Langasite crystal possesses some great properties, such as higher electromechanical coupling factor than quartz, no phase transition from room temperature to melt point. Some properties of langasite crystal are shown in Table 1 and Table 2.
With the rapid development of the communication technology, the new generation communication system enables people not only to talk, but also to transmit image, data and video. Langasite crystal possesses high SAW properties compared with quartz, which make it to be the most competitive material in this field. SAW properties of langasite and quartz are listed in the Table 3.
First Reference Flat
Second Reference Flat
following customer specifications
Other sizes reflected in customer specifications
Table 1 Dielectric, piezoelectric, elastic stiffness constants and their first order temperature coefficients of langasite crystal
Elastic Stiffness（1011 Pa）
First Order Temp. Coef.（10-6·K-1）
Table 2 Comparative properties of piezoelectric crystals
|Properties \ Crystal|
Lithium tetraborate Li2B4O7
Lithium tantalate LiTaO3
Electromechanical Coupling Factor K, %(BAW)
Frequency Spacing Δf, %
Q-Factor Q, ×103
Temperature Frequency Coefficient
Table 3 SAW properties of langasite and Quartz
|Properties \ Crystal|
SAW Velocity Vef, m/s
(0°, 132.75°, 0°)
(0°, 140°, 25°)
Electromechanical coupling factor K2emc, %(SAW)
Second order temp. coef.
Temp. Coef. TTO, ℃
Dielectric Constant e
Power flow angle F, °
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