Lithium Tantalate Properties

Lithium Tantalate

Fundamental Properties

Item
Melting Point
 
1650° C
Crystal System
 
Trigonal
Point Group
 
3m
Crystal Density
 
7.465 x 103 kg / m3
Curie Temperature (Tc)
  
603.5 ± 5.5°C

Heat Capacity (Cp)

  
100 J / k.mol
Dielectric Constants
(T11)
53.6
 
(T33)
43.4
Elastic Constants
(CE11)
2.331 x 1011 N / m2
 
(CE12)
0.464
 
(CE13)
0.852
 
(CE14)
-0.161
 
(CE33)
2.761
 
(CE44)
1.029
Piezoelectric Strain Constants
(e15)
2.63 C / m2
 
(e22)
1.84
 
(e31)
-0.11
 
(e33)
1.93

Typical Acoustic Properties

Surface Acoustic Wave Properties

Description Propagation Design Surface Wave Velocity (m/s) Coupling Coefficient k² (%) Group Delay Time Temp Coefficient (ppm/°C) Propagation Loss of SAW (dB/cm)
36 ° Y - Cut X - Axis SSBW 4160 5.0 28 ~ 32 -
42° Y - Cut X - Axis
SSBW
 4022 7.6 40 -
X - Cut 112.2 Y Direction SAW 3290 0.75 18 -
SAW = Surface Acoustic Wave    L, SAW =Leaky SAW

Selective Piezoelectric Coupling Factors & Frequency Constants

Plate Orientation Wave Type Coupling Factor Resonance Frequency Constant (MHz-mm)
X
S
0.44
1.906
Z
E
0.19
3.040
36° Y - Cut
QE
-
-
163° Y - Cut
QS
-
-
E = extensional   S = shear   QE = quasi - extensional   QS = quasi - shear

Typical Optical Properties

Electro-Optic Coefficients r(10-12 mV-1) at 632.8 nm

rT13
8.4
rS13
7
rT22
-
rS22
1
rT33
30.5
rS33
30.3
rT51
-
rS51
20

Nonlinear Optical Coefficients at 1-06 μ m (*d31=d15)

d22 / l d36KDP l
4.4
d31 / l d36KDP l
-2.7
d33 / l d36KDP l
-4.1

Refractive Index at 632.8 nm

no
2.1787
ne

2.1821
no: TE mode    ne: TM mode