Langasite- La3Ga5SiO14 crystals is a new piezoelecrictric materials with the value of electromechanical coupling coefficient, which is, intermediate between this coefficient of a quartz crystal and that of lithium tantalate. The main comparative characteristics of these crystals are given in table below：
Comparative characteristics of piezoelectric crystals.
| Characteristics\Crystals | Quartz, SiO2 | Langasite, La3Ga5SiO14 | Lithium tetraborate, Li2B2O3 | Lithium tantalate, LiTaO3 |
| Electromechanical Coupling Factor K2emc, % (BAW) | 7.0 | 15.8 | 24.0 | 47.0 |
| Frequency Spacing Δf, % | 0.25 | 0.90 | 4.00 | 7.00 |
| Q-factor Q, ×103 | 100 | 50 | 10 | 2 |
| Temperature Frequency Coefficient TFC, ×10-6/°C | 0.5 | 1.6 | 6.0 | 4.0 |
- LGS/La3Ga5SiO14/Langasite Data
- U.S. Dept. of Commerce requires End User Certificate for exporting this product. For certain oversea customer , we may request you to fill the form of STATEMENT BY ULTIMATE CONSIGNEE AND PURCHASER