Lithium niobate

Lithium Niobate - colorless piezoelectric crystal that belongs to 3M symmetry class. Chemical formula: - LiNbO3. It is ferroelectric. Method for the production - the Czochralski method. Due to the high value of propagation velocity of the wafer surface wave, elements made of LN are used for surface acoustic waves (SAW) devices. LN crystals are also used in bulk acoustic waves (BAW) devices and as acoustooptical Q-switches. Lithium Niobate crystal industrial growth technology was restored by Fomos-Materials specialists.

Characteristic Value Measurement units
1. Hygroscopic property N/A -
2. Hysteresis effect N/A -
3. Specific dielectric capacity 50.2 (YZ);
56.7 (128°YX);
51.9 (64°YX);
62.4 (41°YX)
-
4. Symmetry class 3m -
5. Thermal-expansion coefficient (at 25°C) α11 = 15.74;
α33 = 7.5
mкK-1
6. EMC coefficient (SAW) 5.04 (YZ);
5.7 (128°YX);
10 (64°YX);
17 (41°YX)
%
7. Cell parameters a = 0.515x10-10;
c = 13.863x10-10
m
8. Density 4.65 g/cm3
9. Pyroelectric effect Yes -
10. Piezoelectric modulus d15 = 74;
d22 = 20.7;
d31 = -0.66;
d33 = 16.1
pC/N
13. SAW velocity 3488 (YZ);
3980 (128°YX);
4690 (64°YX);
4750 (41°YX)
m/s
12. Mohs hardness 5 – 5.5 -
13. Curie temperature 1145 оС
13. Melting temperature 1240 оС
14. Temperature Frequency Coefficient -95 (YZ);
-72 (128°YX);
-70 (64°YX);
-70 (41°YX)
ppm/°C