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氟化锂 Lithium Fluoride (LiF)

 

Crystallographic

 

Syngony

Cubic

Symmetry Class

m3m

Lattice Constants

a = 4.026 Å c = a

Cleavability

(100), perfect

 

Optical

 

Refractive Index at ne

1.3931

Refractive Index at nF' - nC'

0.0040

Thermal Coefficient of Refractive Index at 3.39 microns for±60 ℃

(-1.25) ... (-1.51) x 10-5

Transmission Range, microns

0.12 - 6.5

 

Thermal

 

Thermal Linear Expansion, ℃-1 for ±60 ℃

(28.1 ... 34.8) x 10-6

Thermal Conductivity, W/(m * ℃) at 38 ℃

14.2

Specific Heat Capacity, J/(kg * ℃)

1.5617 x 103

Melting Point, ℃

870

 

Mechanical

 

Density, g/cm3 at 20 ℃

2.60

Mohs Hardness

4

Vickers Microhardness, Pa

98 x 107

Constants of Elastic Compliance, Pa-1

S11 = 11.32 x 10-12 S12 = -3.06 x 10-12

S44 = 15.91 x 10-12

Young Modulus (E), Pa


in <100> direction

8.84 x 1010

in <111> direction

14.22 x 1010

Shear Modulus (G), Pa


in <100> direction

4.09 x 1010

in <111> direction

6.29 x 1010

Poisson Ratio

0.270

 

Chemical

 

Molecular Weight

25.94

Solubility


in water, gram/100 cm3

0.27

in acids

soluble

 

Ref. Index vs. Wavelength λ

 

Wavelength, Microns

Refractive Index

0.2

1.439

0.5

1.3943

1.0

1.3871

2.0

1.3788

3.0

1.3666

4.0

1.3494

5.0

1.3266

6.0

1.2975

7.0

1.262

8.0

1.218

9.0

1.165

10.0

1.101

 

Internal Transmittance τ i (λ) vs. Wavelength λ

 

Wavelength, Microns

Internal Transmittance

0.2

0.90

0.5

0.98

1.0

0.97

3.0

0.97

5.0

0.88

6.0

0.65

7.0

0.14


Custom sizes and specifications are available on request.


 

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