Langatate - Lanthanum Gallium Tantalate is a crystal with the structure of calcium-gallogermanate, point symmetry group -32, chemical formula: La3Ga5,5Ta0,5O14, method for the production - the Czochralski method. Langatate is a piezoelectric crystal, which has no hysteresis, pyroelectric and ferroelectric effects. LGT is not hygroscopic, and the temperature stability of piezoelectric coefficients allows to produce sensitive elements from it for high-temperature sensors of physical quantities on a direct piezoelectric effect.
| № | Characteristic | Value | Measurement units |
|---|---|---|---|
| 1. | Hygroscopic property | N/A | - |
| 2. | Hysteresis effect | N/A | - |
| 3. | Dielectric capacity | ε11 = 18,3; ε33 = 60 | - |
| 4. | Q-factor | 50000 | - |
| 5. | Symmetry class | 32 | - |
| 6. | Thermal-expansion coefficient | α11 = 6,087; α33 = 3,827 | mkK-1 |
| 7. | EMC coefficient (BAW | 30 | % |
| 7. | EMC coefficient (SAW) | 0,58 | % |
| 8. | Young's modulus | YE11 = 11x1010; YE33 = 19x1010 | N/m2 |
| 9. | Cell parameters | a = 8,228x10-10; c = 5,129x10-10 | m |
| 10. | Pyroelectric effect | N/A | - |
| 11. | Density | 6,13 | g/cm3 |
| 12. | Piezoelectric modulus | -d11 = 6,5; d14 = 4,7 | pC/N |
| 13. | Insulation resistance | >1х1012 at 25°; | Ohm |
| 14. | Curie temperature | N/A | оС |
| 15. | Melting temperature | 1470 | оС |
| 16. | Resistivity | 1,5х107 | ohm*cm |
| 17. | Elastic flexibility | SE11 = 9x10-12; SE33 = 5,2x10-12 | m2/N |