Sapphire
Chemical formula | Al2O3 | |
Physical: | ||
Crystallographic structure | Hexagonal | |
Density | 3.98 gm/cc | |
Melting point | 2040°C | |
Solubility | 98 x 10-6 gm/100 gm H2O | |
Maximum operating temperature | 2000°C | |
Thermal expansion | 3.2 - 8.4 x 10-6/°C | |
Optical: | ||
Standard orientations | ||
| C-Axis | (0001) | |
| A-Axis | (1120) | |
| M-Axis | (1010) | |
| R-Axis | (1102) | |
Lattice constant | a = 4.758 Å | |
c = 12.991 Å | ||
Dielectric constant | 10.6 parallel to C axis at 300 mHz | |
8.6 perpendicular to C axis at 300 mHz | ||
Optical transmission range | 0.15 - 5.5 microns | |
Refractive index | 1.755 at 1.0139 microns |
- Sapphire is a most useful material for harsh environmental applications.
- Excellent quality of hardness, high strength and chemical stability.
Protective windows:
Standard or UV stable
Maximum diameter: 8 inch
Minimum diameter: 0.25 inch
Minimum thickness: 0.33 mm
Finish (S/D): 80/50, 60/40 maximum
Typical usage: gas, temperature and pressure meter windows
Scanner windows:
Size: 8 " x 1.5 " or 6 " x 6
Minimum thickness: 0.33 mm
Finish (S/D): 80/50 or 60/40
Optical substrates, epi growth substrates and electro-optical units
Wedges:
Max. and min. wedge angle: 15 minute to 60 degrees
Maximum diameter: 4 inch
Finish (S/D): 80/50 or 60/40
Optical and mechanical rods, plates and parts
Wafer carriers:
Sizes: 1", 2", 3"and 4"diameter
Thickness: 0.33 mm, 0.45- 0.5 mm, 1 mm
Rods:
Diameters: up to 30 mm
Lengths: up to 300 mm
Tolerances: (standard) 0.05 mm
Produced by EFG growth process
Tubes:
Outside diameter: up to 40 mm
Inside diameter: over 0.8 mm
Lengths: up to 300 mm
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