 | | Sapphire Crystal |
Specifications
Properties depend on crystallographic direction (relative to the optical C-axis).Sapphire wafer is a single crystal (Al2O3)Sapphire single crystal is highly trusted material with its excellent chemical stability, mechanical property, and light transmission.
| Crystal systems | Hexagonal |
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| Lattice constant | c = 4.765Å
c = 13.001Å |
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| Hardness | 9 (Mohs) |
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| Density (g/cm3) | 3.98 |
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| Melting point | 2,040 |
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| Dielectric constant | 11.5oC (Parallel to the c-axis) 103-1010Hz 25
9.3oC (Perpendicular to the c-axis) 103-1010Hz 25 |
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| Thermal conductivity (cal/cm secoC) |
6.0x10-2 (Parallel to the c-axis)
5.5x10-2 (Perpendicular to the c-axis)
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| Thermal expansion (at 1,000oC) |
9.0x10-6 (Parallel to the c-axis)
8.3x10-6 (Perpendicular to the c-axis)
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| Transmission range | 0.17-6.5 |
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