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Lithium Fluoride is manufactured for windows, prisms, and lenses in the vacuum UV, UV, visible and infrared with a transmission range from 0.11 um to 7 µm. Because its particular lattice structure makes it the most useful analysis crystal, Lithium Fluoride can be used as X-Ray monochromator plates. LiF is sensitive to the thermal shock and attacked by atmospheric moisture at 400 °C
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Figure 1: External transmittance curve for Lithium Fluoride crystal
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Crystal Structure |
Cubic
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Lattice Constant (Å) |
4.026
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Cleavage plane (Å) |
<100>
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Transparency Range (nm) |
110~7000
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Constant of Dispersion (dn/dT)
(/°C and 1.1um )
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dn/dT=-1.50X10-5
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Melting Point (°C)
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870
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Thermal Conductivity (W/(m K) at 310 K):
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4.01
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Heat Capacity: (J/gK):
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1.56
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Linear Coefficient of Thermal Expansion ( /°C)
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18.9X10-6
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Refractive Indices |
n=1.39 at 1um
n=1.30 at 6um
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Density (g/cm3) |
2.639
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Knoop Hardness |
99.1 |
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Young's Modulus (GPa) |
64.97 |
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Shear Modulus (GPa) |
55.14 |
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Poisson Ratio |
0.32 |
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Table 1:Lithium Fluoride Properties
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