PROPERTIES of Magnesium Fluoride (MgF2)

MECHANICAL PROPERTIES
Young Modulus : 138.5 GPa
Shear Modulus : 54.66 GPa
Bulk Modulus : 101.32 GPa
Knoop Hardness : 5.7 GPa
Poisson's Ratio : 0.276
Elastic Coefficients : C11=140; C12=89; C44=57; C13=63; C66=96
Apparent Elastic Limit : 49.64 MPa
Solubility : none
Density : 3.18 g/cm3

THERMAL PROPERTIES
Melting Point : 1255°C
Specific Heat : 0.24 cal/(g·°C) at 25°C
: 0.362 cal/(g·°C) at 1427°C
Thermal Expansion Coefficient
Parallel : 14x10-6 °C-1 at 37°C
Perpendicular : 8.9x10-6 °C-1 at 37°C
Thermal Conductivity : 14-15 W/(m·°C) at 27°C

ELECTRICAL PROPERTIES
Dielectric Constant : 5.45 for 29x10-3 -42x106 Hz

OPTICAL PROPERTIES
Transmission Range : 0.11...7.5μm
Transmittance : 90% (1.5...7μm; 1mm thick)
Refractive Index : N0=1.3836 at 0.405μm; Ne=1.3957 at 0.405μm
Absorption Coefficient : 40x10-3 cm-1 at 2.7μm