Optical Properties
Transmission range in µm @10% min. 0.18 - 25.1
Transmission range in µm @50% min. 0.18 - 25.0
Refractive index @ 633nm 1.488099
(1.45644 @10µm)
Reflection losses in % at 1 surface 3.45 @ 10µm
Reflection losses in % at 2 surfaces 6.7 @ 10.6µm
dn/dT in 1/K -33.2 · 10-6
Physical Properties
Density in g/cm³ 1.989
Melting point in °C 776
Specific heat capacity in J/(kg · K) 6936
Thermal Conductivity in W/(m · K) 6.53
Thermal Expansion in 1/K 36 · 10-6
Dielectric constant 4.64
Solubility in water in g/100g 34.7 @ 20°C
Mohs hardness 2
Knoop hardness in kg/mm² 18,2 (<100>)
Material type Single crystal, synthetic
Crystal type cubic face-centered
Crystal structure Fm3m
Lattice constant in Å a = 6.29
Elastic coeficients in GPa C11 = 40.5
C12 = 6.9
C44 = 6.27
Young's Modulus (E) in GPa 29.63
Shear Modulus (G) in GPa 6.24
Bulk Modulus (K) in GPa 17.36
Rupture Modulus in MPa 4.4
Apparent elastic limit in MPa 4.4
Poisson ratio 0.29
Spectral Properties