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Lithium Fluoride ( LiF )

 

Crystal properties

Crystal Type

cubic, NaCl type structure

Transmission Range

0.12 ... 9 m

Refractive Index

1.37327 @ 2,5 m

Reflective Loss

4.4 % @ 4.0 m

Reststrahlen

25 m

Density

2.63905 g/cm3

Melting Point

870; 848 C

Molecular Weight

25.9394

Thermal Conductivity

4.01 W/(m K)

Specific Heat

1562 J/(kg K)

Thermal Expansion

37 106 / K @ 0...100 C

Hardness (Knoop)

102 103 (indenter load: 600 g)

Youngs Modulus

64.79 GPa

Shear Modulus

55.14 GPa

Bulk Modulus

62.03 GPa

Rupture Modulus

10.8 MPa

Elastic Coefficient

C11 = 112

C12 = 45.6

C44 = 3.2 GPa

Dielectric Constant

9.0 @ 25 C, f = 100...109 Hz

Solubility in Water

0.28 g / 100 g @ 18 C

Crystal Structure

Single crystal, synthetic

Cleavage Planes

(100)

Standard Diameter

145 mm, 200 mm

Application

X-ray monochromator plates
optical material for DUV applications

Remarks

tends to create colour centers

 

List of Optical Crystals

Materials

Refractive Index

Transmission
Range (mm)

Density
(g/cm)

Thermal Expansion 
Coefficient (10-6/K) 

BK7 glass

1.5164 (588 nm)

0.330 2.1

2.51

7.5 

SF11 glass

1.78472 (588 nm)

0.370 2.5

4.74

6.8 

F2 glass

1.62004 (588 nm)

0.420 2.0

3.61

8.2 

Fused Silica

1.4858 (308 nm)

0.185 2.5

2.20

0.55 

CaF2

1.399  (5.0 mm)

 0.170 7.8

3.18

 18.85 

BaF2

 1.460 (3.0 um)

 0.15 12.0

4.88

 18.4 

Sapphire

1.755 (1.0mm)

0.180 4.5

3.98

8.4 

Silicon

3.4179 (10mm)

 1.200 7.0

2.33

 4.15 

Ge

4.003 (10 mm)

 1.900 16

5.33

 6.1 

ZnSe

2.40  (10 mm)

0.630 18

5.27

7.8 

ZnS

2.2 (10mm)

0.380 14

4.09

6.5 

LiF

1.39 (500 nm)

 0.150 5.2

2.64

37 

KBr

1.526 (10 mm)

 0.280 22

2.75

43 

 MgF2

no =  1.3836  ne = 1.3957 (405 nm)

0.130 7.0

7.37

a: 13.7         b: 8.48 

YVO4

no = 1.9500  ne = 2.1554 (1.3 mm)

0.400 5.0

4.22

a: 4.46       b: 11.37 

Calcite

no =  1.6557  ne = 1.4852 (633 nm)

0.210 2.3

2.75

a: 24.39        b: 5.68 

Quartz

no =  1.5427  ne = 1.5518 (633 nm)

0.200 2.3

2.65

7.07 

α-BBO

no =  1.6749  ne = 1.5555 (532 nm)

0.190 3.5

3.85

a: 4.0           c: 36 

LiNbO3

 no =  2.2863  ne = 2.2027 (633 nm)

0.370 4.5

4.64

a: 16.7          c: 2.0 

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