Sapphire
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Chemical formula |
Al2O3 |
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Physical: |
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Crystallographic structure |
Hexagonal |
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Density |
3.98 gm/cc |
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Melting point |
2040°C |
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Solubility |
98 x 10-6 gm/100 gm H2O |
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Maximum operating temperature |
2000°C |
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Thermal expansion |
3.2 - 8.4 x 10-6/°C |
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Optical: |
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Standard orientations |
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| C-Axis |
(0001) |
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| A-Axis |
(1120) |
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| M-Axis |
(1010) |
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| R-Axis |
(1102) |
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Lattice constant |
a = 4.758 Å |
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c = 12.991 Å |
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Dielectric constant |
10.6 parallel to C axis at 300 mHz |
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8.6 perpendicular to C axis at 300 mHz |
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Optical transmission range |
0.15 - 5.5 microns |
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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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