Optical Properties
Transmission range in µm @10% min. 0.14 - 15
Transmission range in µm @50% min. 0.14 - 14
Refractive index @ 633nm 1.47326
(1.45@5µm)
Reflexion loss in % at 1 surface 3.4 @ 4µm
Reflexion loss in % at 2 surfaces 6.5 @ 5µm
dn/dT in 1/K -15.2 · 10-6
Physical Properties
Density in g/cm³ 4.89
Melting Point in °C 1368
Specific heat capacity in J/(kg · K) 410
Thermal Conductivity in W/(m · K) 10.9
Thermal Expansion in 1/K 18.4 · 10-6
Dielectric Constant 7.33
Solubility in water in g/100g 0.16 @ 25°C
Mohs hardness 3
Knoop hardness in kg/mm² 82
Material type Single crystal, synthetic
Crystal Type Cubic, CaF2 strukture
Crystal structure cF12
Lattice Constant in Å a = 6.2
Elastic Coefficients in GPa C11 = 91
C12 = 41.2
C44 = 25.3
Youngs's Modulus (E) in GPa 53.07
Shear Modulus (G) in GPa 25.4
Bulk Modulus (K) in GPa 57.8
Rupture Modulus in MPa 26.9
Apparent elastic limit in MPa 26,9
Poissonzahl 0,31
Spectral Properties