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LGS lanthanum gallium silicate crystal (La 3 Ga 5 SiO 14 ) belongs to the space group P321, point group 32, and is a promising new type of piezoelectric material for the manufacture of surface acoustic wave (SAW) and bulk surface wave (BAW) devices. electrical material. At the same time, LGS crystals can be used to make electro-optic Q switches. Devices made of LGS crystals have high thermal stability.
Main Feature
high thermal stability
Low equivalent series resistivity
The electromechanical coupling coefficient is 3-4 times that of quartz
Typical Application
Electro-optic Q-switching switch
SAW filter
Bulk Acoustic Wave Filters, Resonators
Gyroscope etc.
Material Properties
| molecular formula | La 3 Ga 5 SiO 14 |
| Crystal structure | Trigonal system |
| growth method | Czochralski |
| hardness | 6.6 Mohs |
| density | 5.754g/ cm3 |
| melting point | 1470°C |
| Dielectric constant | ε 11 =18.27 ; ε 33 =55.26 |
| Thermal expansion coefficient | α 11 =5.15×10 -6 /K; α 33 =3.65×10 -6 /K |
| Electromechanical Coupling Coefficient | 0.28～0.46 |
| Piezoelectric strain constant | d 11 =6.3 ; d 14 =-5.4 |
Product Parameters
| Dimensions | 2 inches, 3 inches, 10*10*0.5, 20*20*0.5 or customized |
| Thickness Tolerance | ±0.02mm |
| cutting direction | X/Y/Z, (0,138.5,27) or customized, accuracy ±0.2° |
| Parallelism | ＜30″ |
| Perpendicularity | <15' |
| Flatness | <λ/10 @633nm |
| Chamfer | ＜0.1mm @45° |
| smoothness | 10-5 |
