MSE PRO Lithium Fluoride LiF Crystal Substrates
MSE PRO™ Lithium Fluoride LiF Crystal Substrates
LiF crystal has excellent VUV region transmittance. It is used for windows, prisms, and lenses in the visible and infrared in 0.104 um - 7 um. LiF crystal is sensitive to thermal shock and would be attacked by atmospheric moisture at 400°C. In addition irradiation produces color centers. Modest precautions should be taken against moisture and high energy radiation damage. Besides LiF softens at 600°C and is slightly plastic that can be bent into radius plates. The material can be cleaved along (100) plane and less commonly (110), (111) plane. The optical characteristics are good and yet the structure is not perfect and cleavage is difficult. For good structure LiF is less commonly grown by the Kyropoulos method (air-grown) specifically for monochromator plates. High quality LiF is usually grown by modified Bridgman method. Browse our lithium crystals for sale below. Please contact us for customization or bulk order.
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Properties and Specifications: |
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Transmission Range (nm) |
105 ~ 6000 (6 µm) |
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Refractive Index at 0.6 µm |
1.37327 @2.5 µm; 1.624 @0.121 µm |
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Reflection Loss at 0.6 µm |
4.4% @4.0 µm |
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Absorption Coefficient at 2.7 µm (cm-1) |
0.7 x 10-3 |
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Density (g/cm3) |
2.639 |
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Melting Point (°C) |
870 |
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Thermal Conductivity at 314K (Wm-1K-1) |
4.01 |
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Thermal Expansion at 283K (K-1) |
3 x 10-6 |
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Knoop Hardness |
102 - 113 with 600g indenter |
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Dielectric Constants |
9.0 @25°C, f = 100 - 109 Hz |
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Specific Heat Capacity (J Kgm-1K-1) |
1562 |
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Elastic Coefficient |
C11=112; C12=46; C44= 63.5 |
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Apparent Elastic Limit |
11.2 MPa (1620 psi) |
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Poisson Ratio |
0.326 |
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Solubility in 100g water at 20°C (g) |
0.27 |
| Surface Polishing | Ra<1nm for polished side |
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Sizes |
Diameters up to 60 mm. Custom sizes are available upon request |
