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MgF2
Crystal Magnesium Fluoride is used for optical elements in the 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. Magnesium fluoride is a rugged, hard material which is resistant to thermal and mechanical shock. Considerable mechanical shock is needed to cause cleavage which is near perfect when it occurs. The natural form of MgF2 is known as Sellaite. Magnesium fluoride is a positive birefringent crystal grown normally to 135 mm diameter by vacuum Stockbager technique, seeding along the C-axis. |
|
Magnesium
Fluoride (MgF2) |
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BASE PROPERTIES |
PARAMETER |
VALUE |
OPTICAL |
|
Transmission
Range |
0.11 to 7.5 microns |
Refractive Index |
N0=1.3836 Ne=1.3957
at 0.405 microns |
Reflection Loss |
11.2% at 0.12 microns
(2 surfaces) |
Restrahlen Peak |
20 microns |
dN/dT |
+2.3 and +1.7 x 10-6e/
°C at 0.4 microns |
PHYSICAL |
|
Density |
3.177 g/cm3 |
Melting Point |
1255 °C |
Thermal Conductivity |
0.3 W/(m K) at 27
°C |
Thermal Expansion |
13.7and 8.48 x 10-6e/
°C |
Hardness |
Knoop 415 kg/mm2 |
Specific Heat Capacity,
cal/(g K) at 298 K at 1700 K |
0.24 0.362 |
Dielectric Constant |
4.87 parallel and
5.45 perpendicular |
Young's Modulus (E) |
138.5 GPa |
Shear Modulus (G) |
54.66 GPa |
Bulk Modulus (K) |
101.32 GPa |
Elastic Coefficients |
C11=140.2 C12=89.5
C44=56.8 C33=204.7 C13=62.9 C66=95.7 |
Apparent Elastic Limit |
49.64 MPa |
Poisson Ratio |
0.276 |
CHEMICAL |
|
Solubility |
<0.0002 g/100g
water at 0 °C |
Molecular Weight |
62.32 |
Class/Structure |
Tetragonal, can cleave
on C-axis |
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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