Optical Properties
Transmission range in µm @10% min. 0.17 - 23
Transmission range in µm @50% min. 0.18 - 20
Refractive index @ 633nm 1.54159
(1.49065 @10.6µm)
Reflection losses in % at 1 surface 3.93 @ 10µm
Reflection losses in % at 2 surfaces 7.6 @ 10.6µm
dn/dT in 1/K -36 · 10-6
Physical Properties
Density in g/cm³ 2.164
Melting point in °C 801
Specific heat capacity in J/(kg · K) 870
Thermal Conductivity in W/(m · K) 6.49
Thermal Expansion in 1/K 44 · 10-6
Dielectric constant 5.9
Solubility in water in g/100g 36 @ 25°C
Mohs hardness 3
Knoop hardness in kg/mm² 18.2 (<100>)
Material type Single crystal, synthetic
Crystal type cubic face-centered
Crystal structure cF8
Lattice constant in Å a = 5.6
Elastic coeficients in GPa C11 = 49.1
C12 = 12.8
C44 = 12.8
Young's Modulus (E) in GPa 39.98
Shear Modulus (G) in GPa 12.61
Bulk Modulus (K) in GPa 24.42
Rupture Modulus in MPa 2.4
Apparent elastic limit in MPa 3.9
Poisson ratio 0.26
Spectral Properties