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MAGNESIUM FLUORIDE MgF2
Magnesium Fluoride is used for optical elements in the ultraviolet and
infrared where extreme ruggedness and durability is required. Its useful
transmission range is 0.11 µm - 7.5 µm. Irradiation does not lead to color
centers.
Maximum available size: 50 mm Dia x 40 mm Thk.
Sample thickness 10 mm
Main Properties
| Chemical Formula |
MgF2 |
| Crystal Class |
tetragonal |
| Lattice Constant, Å |
a=4.64; c=3.06 |
| Molecular Weight |
62.31 |
| Density, g/cm3 at 291 K |
3.18 |
| Reflection Loss, % for two surfaces in the visible |
4.8 |
| Dielectric Constant for 95 x 103-42x106 Hz |
5.45 |
| Melting Temperature, K |
1528 |
| Thermal Conductivity, W/(m K) at 300 K |
14-15 |
Thermal Expansion, 1/K at 310 K
parallel
perpendicular |
14x10-6
8.9x10-6 |
Specific Heat, cal/(g K)
at 298 K
at 1700 K |
0.24
0.362 |
| Bandgap, eV |
10.8 |
| Solubility in water |
None |
| Knoop Hardness, kg/mm2 |
415 |
| Young's Modulus, GPa |
138.5 |
| Shear Modulus, GPa |
54.66 |
| Bulk Modulus, GPa |
101.32 |
| Apparent Elastic Limit, MPa |
49.64 |
| Poisson Ratio |
0.276 |
Refractive Index
| Wavelength, µm |
0.20 |
0.23 |
0.27 |
0.34 |
0.56 |
| Refractive Index (ne) |
1.43 |
1.42 |
1.41 |
1.40 |
1.39 |
| Refractive Index (no) |
1.42 |
1.41 |
1.40 |
1.39 |
1.38 |
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