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.
| Main performance parameters | |
| 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 | 2.684g/cm3 |
| Mohs Harness | 7 |
| Thermal capacity | 0.18cal/gm |
| Thermal conductivity | 0.0033cal/cm℃ |
| Thermoelectric constant | 1200uv/℃（300℃） |
| Refractivity | 1.544 |
| Thermal expansivity | α11：13.71×10-6 / ℃ α33：7.48×10-6 /℃ |
| 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 |
| Thickness | 0.5mm±0.05mm |
| Roghness | <1.0nm (or < 0.5nm) |
