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Lithium Fluoride (LiF)

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



                              Figure 1: External transmittance curve for Lithium Fluoride crystal

  Crystal Structure Cubic
  Lattice Constant (Å) 4.026
  Cleavage plane (Å) <100>
  Transparency Range (nm) 110~7000
  Constant of Dispersion (dn/dT)
(/°C and 1.1um )
  Melting Point (°C)
  Thermal Conductivity (W/(m K) at 310 K):
  Heat Capacity: (J/gK):
  Linear Coefficient of Thermal Expansion      ( /°C)
  Refractive Indices n=1.39 at 1um
  n=1.30 at 6um
  Density (g/cm3) 2.639
  Knoop Hardness 99.1  
  Young's Modulus (GPa) 64.97  
  Shear Modulus (GPa) 55.14  
  Poisson Ratio 0.32  
  Table 1:Lithium Fluoride Properties

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