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LiF Lithium Fluoride Crystal,  MSE Supplies

LiF Lithium Fluoride Crystal

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LiF crystal has excellent VUV region transmittance. It is used for windows, prisms, and lenses in the visible and infrared in 0.104 μm - 7 μm. LiF crystal is sensitive to thermal shock and would be attacked by atmospheric moisture at 400°C. In addition irradiation produces color centers. Modest precautions should be taken against moisture and high energy radiation damage. Besides LiF softens at 600°C and is slightly plastic that can be bent into radius plates. The material can be cleaved along (100) plane and less commonly (110) plane. The optical characteristics are good and yet 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 method. Browse our lithium crystals for sale below.

 

Properties and Specifications:

 

Transmission Range  (µm)

0.105 ~ 6

Refractive Index at 0.6 µm

1.37327 @2.5 µm; 1.624 @0.121 µm

Reflection Loss at 0.6 µm

4.4% @4.0 µm

Absorption Coefficient at 2.7µm  (cm-1)

0.74×10-3

Density  (g/cm3)

2.639

Melting Point  (°C)

870

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

4.01

Thermal Expansion at 283K  (K-1)

37×10-6

Knoop Hardness

102 - 113 with 600g indenter

Dielectric Constants

9.0 @25°C, f = 100 – 109 Hz 

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 20°C (g)

0.27

Cleavage

(100)

Sizes

145 mm, 200 mm, custom sizes are available

 

Related Publications:

Dislocation velocities, dislocation densities, and plastic flow in lithium fluoride crystals

WG Johnston, JJ Gilman - Journal of Applied Physics, 1959 - scitation.aip.org

 

 


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