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LiF Crystal (Lithium Fluoride)

Crystals >>> Optical Crystals >>> LiF Crystal

LiF crystals shows excellent transmittance in the VUV region. It is used for windows, prisms, and lenses in the visible and infrared in 0.104 μm - 7 μm. LiF crystalis sensitive to thermal shock and would be attacked by atmospheric moisture at 400C. In addition irradiation produces color centers. Modest precautions should be taken against moisture and high energy radiation damage. Besides LiF is softens at 600C and is slightly plastic that can be bent into radius plates. The material can be cleaved along (100) and less commonly (110). 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. High quality LiF is usually grown by modified Bridgman technique. Maximum available size in diameters is 115mm. LiF is slightly plastic and can be bent into radius plates.

Material and Specifications:  

Transmission Range  (m)

0.12 ~ 6

Refractive Index at 0.6 m

1.39181

Reflection Loss at 0.6 m

5.2% (2 surfaces)

Absorption Coefficient at 2.7m  (cm-1)

0.7410-3

Density  (g/cm3)

2.639

Melting Point  (C)

870

Thermal Conductivity at 314K  (Wm-1K-1)

4.01

Thermal Expansion at 283K  (K-1)

3710-6

Knoop Hardness

102 with 600g indenter

Specific Heat Capacity  (J Kgm-1K-1)

1562

Elastic Coefficient

C11=112; C12=46; C44= 63.5

Apparent Elastic Limit

11.2 Mpa (1620 psi)

Poisson Ratio

0.326

Solubility in 100g water at 20C (g)

0.27

Cleavage

(100)

 

    

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