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Lithium Tantalate LiTaO3 Wafer Crystal Substrate

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LiTaO3
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Lithium Tantalate LiTaO3 Wafer Crystal Substrate

Lithium tantalate(LiTaO3) crystal has excellent electro-optic, piezoelectric and pyroelectric properties, the pyroelectric coefficient is 2.3 × 10 -7 C/cm 2 /K. It growth by Czochralski method. LiTaO3 used as a Q-switch in laser technology, as a pyroelectric detector in infrared technology, and used in the electronics industry to make filters and resonators.

The main performance parameters
Crystal structure	Rhombohedral
Lattice constant	a=5.154Å, c=13.783 Å
Melting point	1650 ℃
Density	7.45 g /cm³
Curie temperature	610 ℃
Mohs Hardness	5.5 ~ 6
Thermal expansion coefficient	A a= 1.61 x 10^-6 c= 4.1 x 10^-6 K / A / K
Resistance coefficient	1015 W.m
Dielectric constant	es11 / e0: 39 ~43 es33 / e0: 42 ~43 et11 / e0: 51 ~54 et11 / e0: 43 ~46
Colour	colourless
Transmission range	0.4~5.0 um
Refractive index	no = 2.176 ne= 2.180 @ 633 nm
Surface Roughness (Ra)	<5A

Standard specifications:

Product Name	Optical grade LiTaO3	SAW grade LiTaO3
Orientation	Z-cut +/- 0.2°	36°Y-cut, 42° Y-cut, Y-cut, X-cut (+/- 0.2°)
Standard Size	φ1"(25.4mm) +/-0.1mm φ3" (76.2mm) +/-0.3mm φ4" (100mm) +/-0.3mm 10×10mm +/-0.1mm	φ1"(25.4mm) +/-0.1mm φ3" (76.2mm) +/-0.3mm φ4" (100mm) +/-0.3mm φ6" (100mm) +/-0.3mm 10×10mm +/-0.1mm
Orientation Flat	22mm+/-2mm (3-inch) 32mm+/-2mm (4-inch)	22mm+/-2mm (3-inch) 32mm+/-2mm (4-inch)
Thickness	500μm+/-20μm 1000μm+/-20μm Or Ultra thin wafer (20~60μm)	500μm+/-20μm 1000μm+/-20μm Or Ultra thin wafer (20~60μm)
TTV	<10um	<10um
Curie temperature	605℃+/-0.7℃（DTA method)	605℃+/-3℃（DTA method)
Surface Quality	Single or Double sided polished	Single or Double sided polished
Chamfer	Edge rounding	Edge rounding