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LiTaO3 Piezoelectric Crystals

LiTaO3 Piezoelectric Crystals

Lithium Tantalate (LT, LiTaO3) has unique properties, which as a material finds uses in Electro-Optical and Acousto-Optical applications. These can be : surface acoustic wave devices, bulk acoustic wave devices, piezo-electric transducers and piezoelectric sensors.

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Description
Lithium Tantalate (LT, LiTaO3) has unique properties, which as a material finds uses in Electro-Optical and Acousto-Optical applications. These can be : surface acoustic wave devices, bulk acoustic wave devices, piezo-electric transducers and piezoelectric sensors.

Saw Applications
The 36°and 42°cuts of Lithium Tantalate have shown widespread adoption for the telecommunications mobile phone handset market at frequencies from 800 to 2100 MHz. These orientations show an optimized bandwidth / insertion loss trade off in performance and are dominating the ever expanding mobile handset sales.
For lower bandwidth, higher selection filters other orientations including the 112° rotated cut have shown great promise and are effectively covering the gap between Quartz (Ultra narrow band) and the 36/42° (wideband) models.
Both lithium niobate and lithium tantalate can be grown with different properties for differing applications, research projects and production methods. For example wafers free of pyroelectric discharge, 4" (100mm), orientation 36°or 42°.


Materials Properties

LiTaO3

Crystal symmetry

Trigonal, 3m

Lattice constant, A

a = 5.154, c = 13.783

Density, g/cm3

7.45

Melting point , °C

1650

Curie point , °C

610

Mohs hardness

6

Solubility

Insoluble in water

Color

Colorless or light yellow

Thermal expansion coefficient, 10-6/ °C

aa = 16, ac = 4

Specific heat, cal/g°C

0.06

Thermal conductivity , mW/cm °C

46

Dielectric Constant (@ 100 KHz)

ea = 54 ec = 43

Transparency range, nm

400 - 5500

Refractive indices @ 633 nm

no = 2.175 ne = 2.180

Electro-optic coefficients pm/V @633 nm, high frequency

r33 = 33 r13 = 8 r22 = 20

Nonlinear optical coefficients p/m/V @ 1064 nm

d22 = 2.0 d31 = - 1 d33 = -21

Pyroelectric Coefficient:

-2.3*10-4 C/°C/m2

Optical homogeneity

~10-5

Absorption loss @ 1064 nm

< 0.15 %/cm

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