Catangasite - Calcium Tantalum Gallium Silicate, is a crystal of a langasite group family, having 32-point symmetry group. Chemical formula: Ca3TaGa3Si2O14. Method for the production - the Czochralski method. It has good chemical stability and excellent temperature characteristics. Catangasite has two the steadiest cuts with Euler angles (0°,90°,0°) and (0°,90°,40°). Catangasite used for BAW high-temperature products (500°C). It can also be used in high-temperature (>700°C) sensors of physical quantities.
| № | Characteristic | Value | Measurement units |
|---|---|---|---|
| 1. | Hygroscopic property | N/A | - |
| 2. | Hysteresis effect | N/A | - |
| 3. | Dielectric capacity | ε11 = 18; ε33 = 235 | - |
| 4. | Q-factor | 19000 | - |
| 5. | Symmetry class | 32 | - |
| 6. | EMC coefficient (BAW) | 16 | % |
| 6. | EMC coefficient (SAW) | 0.35 (0°;90°;0°); 0.16 (0°;90°;40°) | % |
| 7. | Cell parameters | a = 8.141x10-10; c = 4.992x10-10 | m |
| 8. | Pyroelectric effect | N/A | - |
| 9. | Density | 4.62 | g/cm3 |
| 10. | Piezoelectric modulus | d11 = 4; d14 = 14 | pC/N |
| 13. | SAW velocity | 2777 (0°;90°;0°); 2815 (0°;90°;40°) | m/s |
| 11. | Insulation resistance | >1х1012 at 25°C; >1x108 at 538°С | ohm |
| 12. | Curie temperature | N/A | оС |
| 13. | Melting temperature | 1350 | оС |
| 14. | Temperature Frequency Coefficient | -35 (0°;90°;0°); 0 (0°;90°;40°) | ppm/°C |
| 14. | Elastic flexibility | SE11 = 8.95x10-12; | m2/N |
| 15. | Resistivity | 1.7х109 | ohm*cm |