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Sapphire Single Crystal Substrate
Single crystal sapphire has a unique combination of physical, chemical and optical properties allowing it to withstand high temperatures, high pressure, thermal shock, and water or sand erosion. It is chemically inert, with a low friction coefficient, and excellent electrical, optical, and dielectric characteristics. In addition, its radiation resistance makes it an excellent material for use in optical windows for space applications.
Single crystal sapphire possesses excellent optical, physical and chemical properties. It is the hardest oxide crystals, and remains high strength and chemical resistance at high temperatures. It also features a wide transmission wavelength range, great electrical insulation, and good thermal conductivity at low temperatures.
Physical Specifications:
Chemical Formula Al2O3
Crystallographic Structure Hexagonal
Density 3.98 gm/cc
Melting Point 2040 oC
Solubility 98 x 10-6 gm/100 gm H2O
Maximum Operating Temperature 2000 oC
Thermal Expansion 3.2 - 8.4 x 10-6/oC
Optical Specifications:
Standard Orientations:
C-Axis (0001)
A-Axis (1120)
M-Axis (1010)
R-Axis (1102)
Optical Transmission Range: 0.15 - 5.5 microns
Refractive Index: 1.755 at 1.0139 microns
Forms / Sizes Available:
Plates: 10 mm x 10 mm, 25 mm x 25 mm, 50.8 mm diameter
Wafer Carriers: 50.8 mm, 107.95 mm, 125 mm & 152 mm diameters
Rods: 0.25 – 12 inch diameters, to 14 inch length
Tubes: 0.3 – 20 mm wall thickness, to 900 mm lengths
Windows and Discs: Up to 12 inch diameters
Polishing of 1 or 2 faces: 20/10, 60/40 or 80/50 (s/d)
