Optical properties
Transmission range @10% min. 0,14 - 15
Transmission range @50% min. 0,14 - 14
Brechungsindex @ 633nm 1,47326
(1,45@5µm)
Reflection losses in % at 1 surface 3,4 @ 4µm
Reflection losses 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
Spezific heat capacity in J/(kg · K) 410
Thermal conductivity in W/(m · K) 10,9
Thermal expension in 1/K 18,4 · 10-6
Dielectric constants 7,33
Solubility in water in g/100g 0,16 @ 25°C
Mohs hardness 3
Knoop hardness in kg/mm² 82
Material type Single crystalline, synthetic
Crsytal type kubisch, CaF2-Struktur
Crystal structure cF12
Lattice constant in Å a = 6,2
Elastic coefficient in GPa C11 = 91
C12 = 41,2
C44 = 25,3
Young'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
Poisson ratio 0,31
Spectral properties