Crystal properties
Crystal Type	cubic, CaF2 type structure
Transmission Range	0.15 ... 15 µm
Refractive Index	no = 1,6654 ne = 1,4898 @ 509 nm
Density	4.89 g/cm3
Melting Point	1280, 1355 °C
Molecular Weight	175.3368
Thermal Conductivity	11.72 W/(m K) @ 13 °C
Specific Heat	410 J/(kg K) @ 27 °C
Thermal Expansion	18.1 x 10-6 / K @ - 110...120 °C
Hardness (Knoop)	82 (indenter load: 500 g)
Young's Modulus	56.4 GPa
Shear Modulus	25.4 GPa
Bulk Modulus	268.89 GPa
Rupture Modulus	26.2 Mpa
Elastic Coefficient	C11 = 90.4
C12 = 40.6
C44 = 25.3 Gpa
Dielectric Constant	7.33 @ f = 2 MHz
Solubility in Water	0.17 g / 100 g @ 23 °C
Crystal Structure	single crystal, synthetic
Cleavage Planes	(111)
Application	Scintillation material correction part in lens systems
Remarks	radiation resistant susceptible to thermal shock laser damage threshold: 27,5 GW/cm2, @ 3.8 µm, 75 ns pulse length
List of optical crystals