Optical and spectral properties
Transmission range @10% min. 1,8 - 24
Transmission range @50% min. -
Refractive index @633nm 4,10417
(4,0026 @11µm)
Reflection losses in % at 1 surface 36,04 @10µm
Reflection losses, % for two surfaces 53 @10,6µm
dn/dT in 1/K 396 · 10-6
Physical properties
Density in g/cm³ 5,327
Melting point in °C 938,25
Specific heat capacity in J/(kg · K) 310
Thermal conductivity in W/(m · K) 58,61
Thermal expansion in 1/K 5,9 · 10-6 @293K
Dielectric constant 16,6
Solubility in water in g/100g insoluble
Mohs hardness 6
Knoop hardness in kg/mm² 800
Material type single crystalline, synthetic
Kristalltype kubisch flächenzentriert, Diamantstruktur
Crystal structure Fd3m
Lattice constant in Å a = 5,62
ElastizitätsKonstanten in GPa C11 = 129
C12 = 48,3
C44 = 67,1
Young's Modulus (E) in Gpa 102,7
Shear Modulus (G) in GPa 67
Bulk Modulus (K) in GPa 77,2
Rupture Modulus in MPa 110
Apparent elastic limit in MPa 8926
Poisson's ratio 0,2
Spectral properties
sample thickness: 2 mm