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Silicon (Si) Optical Crystals

Silicon (Si) is commonly used as a window material for far infrared transmission. Although the material has an absorbance edge at about 8 microns, it transmits in the 50 to 100+ micron range, making it a useful alternative to CsI for aqueous samples analyzed by IR spectroscopy. It is also useful for some ATR applications.

Optical Properties - Silicon (Si) Optical Crystals

Transmission Range: 1.2m to 10m & 48 to >100 m
Refractive Index: 3.42 at 10 m
Reflection Loss: 46% at 10 m ( 2 surfaces)

Physical Properties - Silicon (Si) Optical Crystals

Melting Point: 1420° C
Hardness (Knoop): 1150 kg/mm2
Young's Modulus: 131 GPa
Modulus of Rupture: 9000
Structure: Cubic

Chemical Properties-- Silicon (Si) Optical Crystals

Solubility: insoluble in water. Insoluble in most acids and bases. Soluble in HF and HNO3