Lithium Fluoride – LiF

lenses, windows, mirrors, filters and prisms

This material is used for the maufacture of optical windows, lenses, prisms, x-ray monochromator plates, and refracting components in the vacuum ultraviolet, visible and infrared. Lithium Fluoride is attacked by atmospheric moisture and is sensitive to thermal shock.

Transmission Range 0.11 – 9.0 µ
Crystal Structure Rock Salt
Cleavage Plane 100
Colour colourless
Density 2.639 (25°)
Melting Point (°) 848
Reflection Loss 4.4% (4µ) for 2 surfaces
Solubility index 0.27gm/100gm water 20°C
Hardness (Knoop) 102 – 113
Thermal Conductivity (cal/cm sec°C) 2.7x10-2 (41°C)
Thermal Expansion coefficient (/°C) 37x10-6(0-100°C)

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