Almaz Optics, Inc.
12 Chadsford Ct.  Marlton, NJ 08053, USA
Tel:  856 797-0491, Fax: 856 797-0228
e-mail: mail@almazoptics.com

 

































LITHIUM FLUORIDE LiF

Lithium Fluoride is used for windows, prisms, and lenses in the vacuum UV, UV, visible and infrared where desired transmission is in the 0.104 m - 7 m range. Modest precautions should be taken against moisture and high energy radiation damage. LiF is attacked by atmospheric moisture at 400 C and softens at 600 C. LiF is sensitive to thermal shock. Irradiation produces color centers. The material can be cleaved. VUV grade is available.
Maximum available size: 100 mm Dia x 40 mm Thk.



Sample thickness 10 mm


Main Properties

Chemical Formula LiF
Crystal Class Cubic
Lattice Constant, 4.03
Molecular Weight 25.94
Density, g/cm3 (20 C) 2.60
Reflection Loss, % for two surfaces at 4 m 4.4
Dielectric Constant for 102-1010 Hz at 298 K 9.0
Melting Temperature, K 1140
Thermal Conductivity, W/(m K) at 314 K 11.3
Thermal Expansion, 1/K at 300 K 34.4 x 10-6
Specific Heat, cal/(g K) at 283 K 0.37
Debye Temperature, K 732
Bandgap, eV 13.6
Solubility, g/100 g H2O at 291 K 0.27
Knoop Hardness, kg/mm2 100
Young's Modulus, GPa 64.77
Apparent Elastic Limit, MPa 11.2
Shear Modulus, GPa 55.12
Bulk Modulus, GPa 62.0
Poisson Ratio 0.326

Refractive Index

Wavelength, m 0.20 0.22 0.24 0.29 0.39 0.60 1.75 2.75 3.40
Refractive Index 1.44 1.43 1.42 1.41 1.40 1.39 1.38 1.37 1.36