Barium fluorid
BaF2
Barium Flourid 
Crystal properties

Crystal Type.

cubic, CaF2 type structure

 

Transmission Range

0.15 ... 15 µm

 

Refractive Index

no = 1,6654 
ne = 1,4898 @ 509 nm

 

Density

4.89 g/cm3

 

Melting Point

1280, 1355 °C

 

Molecular Weight

175.3368

 

Thermal Conductivity

11.72 W/(m K) @ 13 °C

Specific Heat

410 J/(kg K) @ 27 °C

Thermal Expansion

18.1 × 10–6 / K @ –110...120 °C

Hardness (Knoop)

82 (indenter load: 500 g)

Young’s Modulus

56.4 GPa

Shear Modulus

25.4 GPa

Bulk Modulus

268.89 GPa

Rupture Modulus

26.2 Mpa

Elastic Coefficient

C11 = 90.4

C12 = 40.6

C44 = 25.3 Gpa

Dielectric Constant

7.33 @ f = 2 MHz

Solubility in Water

0.17 g / 100 g @ 23 °C

Crystal Structure

single crystal, synthetic

Cleavage Planes

(111)

Application

Scintillation material
correction part in lens systems

Remarks

radiation resistant
susceptible to thermal shock
laser damage threshold: 27,5 GW/cm2
@ 3.8 µm, 75 ns pulse length

List of Optical Crystals

Materials

Refractive Index

Transmission
Range (mm)

Density
(g/cm³)

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
n= 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