LGS
Langasite crystal (La3Ga5SiO14, LGS) belongs to the intergroup P321, point group 32, and has been reported as a promising new piezoelectric material for fabricating surface acoustic wave (SAW) and bulk surface wave (BAW) devices. At the same time, LGS crystals can be used to make electro-optical Q-switches. Devices based on LGS crystals have high thermal stability.
- Product Description
-
Main Advantages:
High thermal stability
Low Equivalent Series Resistivity
Electro-mechanical coupling coefficient is 3-4 times that of quartz
Typical applications:
Electro-optical tuning Q switch, acoustic surface wave filter, body acoustic wave filter, resonator, optical gyroscope etc.
- Material Properties
-
Chemical Formula
La3Ga5SiO14
Crystal Structure
Trigonal system, group33
Growth Method
Czochralski
Hardness
6.6 Mohs
Density
5.754g/cm³
Melting Point
1470℃
Dielectric Constant
ε11=18.27; ε33=55.26
Thermal Expansion Coefficient
α11=5.15×10-6/K; α33=3.65×10-6/K
E-M coupling Coefficient K（%）
0.28～0.46
Piezoelectric Strain Constant (10-12) C/N
d11=6.3; d14=-5.4
- Technical Parameter
-
Crystro Offers:
Size
2"; 3"; 10*10*0.5
Thickness Tolerance
±0.02mm
Orientation
±0.2°, Y, Z,（0,138.5,27）
Parallelism
＜30″
Perpendicularity
＜15′
Flatness
＜λ/10@633nm
Chamfer
＜0.1mm@45°
Surface Quality
10-5
Note: Above parameters for reference only, please contact our sales Rep. for your specific requirement.