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Calcium Fluoride (CaF2)

Calcium Fluoride (CaF2)

APPLICATIONS: Widespread IR application as spectroscopic accessories. Prism and lenses.

Optical Properties

Transmission Range 0.13 to 10 microns
Refractive Index 1.39908 at 5 microns
Reflection Loss 5.4% at 5 microns(2 surfaces)
Restrahelen Peak >35 microns
dN/dT -10.6 x 10-6/C

Physical Properties

Density 3.18 gm/cc
Melting Point 1360 C
Thermal Conductivity

9.71 Wm-1 K -1

Thermal Expansion 18.85 x 10-6/C
Hardness Knoop 158.3 (100)
Specific Heat Capacity

854JKgm-1 K-l

Dielectric Constant

6.76 at 1 MHz

Young's Modulus (E) 75.8 Gpa
Shear Modulus (G) 33.77Gpa
Bulk Modulus (K) 82.71Gpa
Elastic Coeffcients C11 = 164
C12=53
C44=33.7
Apparent Elastic Limit 36.54 Mpa
Poisson Ratio 0.26

Chemical Properties

Solubility 0.0017gm/100gm water at 20
Molecular Weight 78.08
Class/Structure Cubic( 111) cleavage

Index of Refraction

0.48615 microns 1.43704
0.65630 microns 1.43249
0.76653 microns 1.43093
1.08304 microns 1.42843
1.5715 microns 1.42596
2.0582 microns 1.42360
3.0500 microns 1.41750
4.000 microns 1.40963
5.000 microns 1.39908
6.000 microns 1.36805