SiO2
Artificial quartz single crystals are grown in autoclaves by hydro-thermal method and with left-handed and right-handed forms. Quartz crystals have a low stress birefringence and a high refractive index uniformity, with a light transmission range of 0.15-4 μm. Quartz crystals, for their piezoelectric properties, low thermal expansion coefficient, excellent mechanical and optical properties, are used in electronic, precision optical and laser technologies, optical communication, X-ray optical.CasCrysTech (CCT) provides high quality Silicon dioxide (SiO2) crystals upon request from customers.
Uses/Applications
Electronic, precision optical and laser technologies, optical communication, X-ray optical.
Features/Benefits
Quartz crystals have a low stress birefringence and a high refractive index uniformity, with a light transmission range of 0.15-4 μm.
Quartz crystals have good piezoelectric properties, low thermal expansion coefficient, excellent mechanical and optical properties.
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Growth Method
Hydro-thermal
Crystal Structure
Hexagon
Lattice Constant
a=4.914Å c=5.405 Å
Melting Point
1610℃（phase transition temperature：573.1℃）
Density
2.684 (g/cm3)
Mohs Harness
7 (mohs)
Specific heat
0.18 (cal/gm)
Thermal Conductivity
0.0033 (cal/cm/ ℃)
Thermoelectric Constant
1200 μv/℃（300℃）
Refractive Index
1.544
Thermal Expansion
α11：13.71×10 -6 / K α33：7.48×10- 6 /K
Q value
1.8×106 min
Sound Speed (SAW)
3160（m/sec）
Frequency Constant
1661（kHz/mm）
Pressure Electric Conjugation
K2(%) BAW: 0.65 SAW: 0.14
Orientation
Y、X or Z cut，ST cut , AT cut
Orientation Tolerance
+/- 12’/30’
Dimension
Φ2″(50.8mm)、Φ3″(76.2mm)、Φ4″(100mm)±0.2mm
Primary Orientation Flat：16±1.5mm (Φ2″);22±1.5mm (Φ3″) ;32±3.0(Φ4″)Thickness
0.5mm±0.05mm
Roghness
<1.0nm (or < 0.5nm)
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Φ2″(50.8mm)、Φ3″(76.2mm)、Φ4″(100mm)±0.2mm
Primary Orientation Flat：
16±1.5mm (Φ2″);22±1.5mm (Φ3″) ;32±3.0(Φ4″)