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Barium fluorid ( BaF2 )
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Crystal properties
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Crystal Type.
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cubic, CaF2 type structure
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Transmission Range
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0.15 ... 15 ľm
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Refractive Index
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no = 1,6654
ne = 1,4898 @ 509 nm
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Density
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4.89 g/cm3
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Melting Point
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1280, 1355 °C
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Molecular Weight
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175.3368
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Thermal Conductivity
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11.72 W/(m K) @ 13 °C
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Specific Heat
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410 J/(kg K) @ 27 °C
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Thermal Expansion
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18.1 × 106 / K @ 110...120 °C
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Hardness (Knoop)
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82 (indenter load: 500 g)
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Youngs Modulus
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56.4 GPa
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Shear Modulus
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25.4 GPa
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Bulk Modulus
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268.89 GPa
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Rupture Modulus
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26.2 Mpa
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Elastic Coefficient
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C11 = 90.4
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C12 = 40.6
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C44 = 25.3 Gpa
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Dielectric Constant
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7.33 @ f = 2 MHz
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Solubility in Water
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0.17 g / 100 g @ 23 °C
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Crystal Structure
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single crystal, synthetic
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Cleavage Planes
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(111)
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Application
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Scintillation material
correction part in lens systems
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Remarks
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radiation resistant
susceptible to thermal shock
laser damage threshold: 27,5 GW/cm2,
@ 3.8 ľm, 75 ns pulse length
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 Up
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List of Optical Crystals
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Refractive Index
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Transmission
Range (mm)
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Density
(g/cmł)
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Thermal Expansion
Coefficient (10-6/K)
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BK7 glass
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1.5164 (588 nm)
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0.330 2.1
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2.51
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7.5
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SF11 glass
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1.78472 (588 nm)
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0.370 2.5
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4.74
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6.8
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F2 glass
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1.62004 (588 nm)
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0.420 2.0
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3.61
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8.2
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Fused Silica
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1.4858 (308 nm)
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0.185 2.5
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2.20
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0.55
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CaF2
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1.399 (5.0 mm)
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0.170 7.8
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3.18
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18.85
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BaF2
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1.460 (3.0 um)
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0.15 12.0
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4.88
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18.4
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Sapphire
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1.755 (1.0mm)
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0.180 4.5
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3.98
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8.4
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Silicon
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3.4179 (10mm)
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1.200 7.0
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2.33
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4.15
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Ge
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4.003 (10 mm)
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1.900 16
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5.33
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6.1
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ZnSe
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2.40 (10 mm)
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0.630 18
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5.27
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7.8
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ZnS
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2.2 (10mm)
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0.380 14
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4.09
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6.5
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LiF
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1.39 (500 nm)
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0.150 5.2
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2.64
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37
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KBr
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1.526 (10 mm)
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0.280 22
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2.75
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43
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MgF2
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no = 1.3836 ne = 1.3957 (405 nm)
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0.130 7.0
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7.37
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a: 13.7 b: 8.48
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YVO4
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no = 1.9500 ne = 2.1554 (1.3 mm)
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0.400 5.0
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4.22
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a: 4.46 b: 11.37
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Calcite
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no = 1.6557 ne = 1.4852 (633 nm)
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0.210 2.3
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2.75
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a: 24.39 b: 5.68
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Quartz
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no = 1.5427 ne = 1.5518 (633 nm)
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0.200 2.3
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2.65
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7.07
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α-BBO
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no = 1.6749 ne = 1.5555 (532 nm)
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0.190 3.5
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3.85
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a: 4.0 c: 36
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LiNbO3
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no = 2.2863 ne = 2.2027 (633 nm)
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0.370 4.5
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4.64
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a: 16.7 c: 2.0
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