Optical Properties
Transmission range in µm @10% min. 0.48 - 20
Transmission range in µm @50% min. 0.5 - 20
Refractive index @ 633nm 2.5906
(2.4028 @10.6µm)
Reflection losses in % at 1 surface 17.05 @ 10µm
Reflection losses in % at 2 surfaces 29.1 @ 10.6µm
dn/dT in 1/K 61 · 10-6
Physical Properties
Density in g/cm³ 5.27
Melting point in °C Subl. @ >500
Specific heat capacity in J/(kg · K) 339
Thermal Conductivity in W/(m · K) 18
Thermal Expansion in 1/K 7.1 · 10-6 @ 271K
Dielectric constant 9.12
Solubility in water in g/100g unsoluble
Mohs hardness 4
Knoop hardness in kg/mm² 110
Material type Polycrystalline, synthetic
Crystal type cubic
Crystal structure F43m
Lattice constant in Å a = 5.67
Elastic coeficients in GPa C11 = 86.4
C12 = 51.5
C44 = 40.2
Young's Modulus (E) in GPa 70.3
Shear Modulus (G) in GPa 28.9
Bulk Modulus (K) in GPa 63.1
Rupture Modulus in MPa 55
Apparent elastic limit in MPa 55.1
Poisson ratio 0.3
Spectral Properties