Lithium Flouride

 

MATERIAL: Lithium Fluoride (LiF)
APPLICATIONS: UV and Vacuum UV optics. X-ray monochromator plates.

 

PROPERTY VALUE
   
-OPTICAL-  
Transmission Range 0.12 to 8.5 microns
Refractive Index 1.3943 at 0. 5 microns
Reflection Loss 5.3% at 0.5 microns (2 surfaces)
Restrahlen Peak 25 microns
dN/dT -12.7 x 10-6/ °C at 0.6 microns
   
-PHYSICAL-  
Density 2.63905 gm/cc
Melting Point 870 °C
Thermal Conductivity 4. 01 Wm-1 °K-1 at 41 °C
Thermal Expansion 37 x 10-6/ °C
Hardness Knoop 102 to 113 with 600gm indenter
Specific Heat Capacity 1562 JKgm-1 °K-1 at 10 °C
Dielectric Constant 9.1 at 25 °C
Young's Modulus (E) 64.79 GPa 11
Shear Modulus (G) 55.14 GPa
Bulk Modulus (K) 62.03 GPa
Elastic Coefficients C11=97.4 C12=40.4 C44=55.4
Apparent Elastic Limit 11.2 MPa
Poisson Ratio 0.326
   
-CHEMICAL-  
Solubility 0.27gm/l00gm water at 20 °C
Molecular Weight 25.94
Class/Structure FCC, NaCl structure. Cleavage (100)

NOTES
Lithium fluoride is grown by vacuum Stockbarger technique in diameters of 115mm for VUV quality, transmission of 40% at Lyman alpha (0.1216 microns) through 2mm is guaranteed. Although the optical characteristics are good 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. Cleavage is (100) and less commonly (110). LiF is slightly plastic and can be bent into radius plates.


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