Lithium Tantalate as well as Lithium Niobate belongs to 3M symmetry class. Chemical formula: -LiTaO3. Method for the production - the Czochralski method. Lithium Tantalate crystals are ferroelectric and they have a pronounced pyroelectric effect. Same as Lithium Niobate wafers, wafers and elements made of Lithium Tantalate are used in the production of SAW and BAW devices, especially where the products miniaturization is required.
| № | Characteristic | Value | Measurement units |
|---|---|---|---|
| 1. | Hygroscopic property | N/A | - |
| 2. | Hysteresis effect | N/A | - |
| 3. | Specific dielectric capacity | 47.9 (112°YX); 50.2 (42°YX) | - |
| 4. | Symmetry class | 3m | - |
| 5. | Thermal-expansion coefficient (at 25°C) | α11 = 16.11; α33 = 4.1 | mкK -1 |
| 6. | EMC coefficient (BAW) | k15 = 68; k31 = 2.3; k33 = 47; k22 = 32; k24 = 60 | % |
| 6. | EMC coefficient (SAW) | 0.66 (112°YX); 5.4 (42°YX) | % |
| 7. | Cell parameters | a = 5.154x10-10; c = 13.781x10-10 | m |
| 8. | Density | 7.45 | g/cm 3 |
| 9. | Pyroelectric effect | Yes | - |
| 10. | Piezoelectric modulus | d15 = 26; d22 = 7; d31 = -2; d33 = 8 | pC/N |
| 11. | Resonance spacing | % | |
| 13. | SAW velocity | 3304 (112°YX); 4214 (42°YX) | m/s |
| 12. | Mohs hardness | 5.5 | - |
| 13. | Curie temperature | 607 | оС |
| 13. | Melting temperature | 1650 | оС |
| 14. | Temperature Frequency Coefficient | -18 (112°YX); -35 (42°YX) | ppm/°C |