Lithium tantalite

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 = 8.07;
d31 = -5.58;
d33 = -19.4
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