Formula LiF
Growth method Stockbarger technique
Max. sizes, (mm) Ø150
Transmission range, (µm)
(Thickness 10 mm)
0.12 – 6.5
Structure Cubic
Density (g/cm3) 2.60
Melting point (°C) 870
Hardness (Mohs) 4
Thermal expansion coefficient (10-6/K) 28.1 – 34.8
Thermal conductivity (W m-1 K-1) 14.2
Specific heat capacity (J kg-1 K-1) 1562
Solubility in water (g/100 cm3) 0.27
Solubility in acids Soluble
Solubility in organic solvents Insoluble in acetone and ethylalcohol
Wavelength (µm)
Refractive index
0.2
0.5
1.0
3.0
5.0
6.0
1.4390
1.3943
1.3871
1.3666
1.3266
1.2975
Absorption coefficient (cm-1) 0.05 at 0.2 µm
0.02 at 0.4 µm
0.03 at 2.6 – 2.9 µm

Lithium Fluoride for UV, VIS and IR-range