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Calcium Fluoride Crystal
CaF2
Applications: Calcium Fluoride Crystal (CaF2) has widespread IR application as spectroscopic accessories, prisms and lenses. It also has a useful application in the UV as Eximer laser windows.
Calcium Fluoride Crystal is available doped with europium as a gamma ray scintillator.
Optical Properties:
Transmission Range: 0.13 – 10 microns
Refractive Index: 1.39908 @ 5 microns
Reflection Loss: 5.4% @ 5 microns (2 surfaces)
Restrahlen Peak: - 10.6 x 10-6/oC
Physical Properties:
Formula: CaF2
Density: 3.18 gm/cm3
Melting Point: 1360oC
Thermal Conductivity: 9.71 Wm-1 oK-1
Thermal Expansion: 18.85 x 10-6/oC
Hardness (Knoop): 158.3
Specific Heat Capacity: 854 J Kgm-1oK-1
Dielectric Constant: 6.76 @ 1MHz
Young’s Modulus: 75.8 GPa
Shear Modulus: 33.77 GPa
Bulk Modulus: 82.71 GPa
Elastic Coefficients: C11=164, C12=53, C44=33.7
Apparent Elastic Limit: 36.54 MPa
Poisson Ratio: 0.26
Chemical Properties:
Solubility: 0.0017 gm/100 gm water @ 20oC
Molecular Weight: 79.08
Class/Structure: Cubic (111) cleavage
Diameter Range: 5 - 200 mm
Thickness Range: 0.5 – 50 mm
Surface Finish(s): Fine Ground, 1 Face or Both Faces Optically Polished