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Si
Wafer
Ư¼º
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Silicon is commonly used as substrate material for infrared reflectors and windows in the 1.5 8 micron
region. The strong absorption band at 9 microns makes it unsuitable for CO2 laser transmission
applications, but it is requently used for laser mirrors because of its high thermal conductivity and
low density. Silicon is also useful as a transmitter in the 20 micron range. Maximum available size: 102 mm Dia 50 mm Thk.
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Chemical
Formula
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Si
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Molecular
Weight
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28.09
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Crystal
Class
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Cubic
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Lattice
Constant,
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A 5.43
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Density,
g/cm3
at
293
K
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2.329
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Dielectric
Constant
for
9.37
x
109
Hz
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13
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Melting
Point,
K
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1690
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Thermal
Conductivity,
W/(m
K)
at
125
K
at
313
K
at
400
K
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598.6 163 105.1
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Thermal
Expansion,
1/K
at
75
K
at
293
K
at
1400
K
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-0.5
x
10E-6
2.6
x
10E-6
4.6
x
10E-6
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Specific
Heat,
cal/(g
K)
at
298
K
at
1800
K
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0.18 0.253
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Debye
Temperature,
K
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640
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Bandgap,
eV
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1.1
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Solubility
in
water
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None
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Knoop
Hardness,
kg/mm2
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1100
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Mohs
Hardness
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7
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Young's
Modulus,
GPa
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130.91
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Shear
Modulus,
GPa
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79.92
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Bulk
Modulus,
GPa
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101.97
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Poisson's
Ratio3
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0.28
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Refractive
Index
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Wavelength,
¥ìm
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1.40
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1.50
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1.66
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1.82
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2.05
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2.50
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3.50-5.00
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6.00-25.00
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Refractive
Index
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3.49
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3.48
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3.47
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3.46
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3.45
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3.44
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3.43
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3.42
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