Calcium Fluoride ( CaF2 )

Crystal properties   Calcium

Crystal Type cubic, CaF2 type structure
Transmission Rang: 0.13 ... 12 µm
Density 3.18 g/cm3
Melting Point 1360, 1395 °C
Molecular Weight 78.0768
Thermal Conductivity 9.71 W/(m K)  
Specific Heat: 854 J/(kg K)  
Thermal Expansion 18.7; 18.85; 24.0 × 10–6 / K  
Hardness (Knoop) 158.3  
Young’s Modulus 75.8 GPa  
Shear Modulu: 33.77 GPa  
Bulk Modulus 82.71 GPa  
Rupture Modulus 36.5 MPa  
Elastic Coefficient: C11 = 164
C12 = 53
C44 = 33.7 GPa
 
Dielectric Constant 6.76 @ 27 °C  
Solubility in Wate: 0.0017 g / 100 g @ 20 °C  
Cleavage Planes (111)  
Applicatio: Spectroscopy, astronomy, lithography
laser windows for Excimer lasers
scintillators (CaF2:Eu)
 
Remarks deliverable in IR, UV and DUV quality  
Grafik
List of Optical Crystals        
Materials Refractive Index Transmissio n
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
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