LGT

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°;
>1x106 at 538°С

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