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: 1.2µm to 10µm & 48 to >100 µm
Refractive
Index: 3.42 at 10 µm
Reflection
Loss: 46% at 10 µm ( 2 surfaces)
Physical
Properties - Silicon (Si) Optical Crystals
Melting
Point: 1420°
C
Hardness
(Knoop): 1150 psi
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
