Magnesium Fluoride (MgF2 )
- Product Item : AT-61148
- Category： Glass-Ceramic Optical Substrates
- Product description：Our crystal growth operation regularly produces Magnesium Fluoride crystals of exceptional quality for use at a variety of wavelengths and in a multitude of applications. Magnesium Fluoride is a durab
Magnesium Fluoride (MgF2 )
Flouride Crystal Materials
Our crystal growth operation regularly produces Magnesium Fluoride crystals of exceptional quality for use at a variety of wavelengths and in a multitude of applications. Magnesium Fluoride is a durable crystal with low absorption, suitable for high-powered laser, space, and other UV applications. MgF2 is also naturally birefringent, making it an ideal material for use where this property can be exploited, such as retardation plates and polarizing elements, particularly in the wavelength range from 0.13-0.30 µm. A full range of geometries and finishes, from ingots and blanks to complex multi-faceted, highly polished parts are available. Standard (001) orientation as well as specifically oriented parts and materials are offered. A variety of finishes and coatings can be customized and combined to meet individual customer specifications.
Physical and Chemical Properties
General Properties
|
CAS# |
7780-40-6 |
|
Molecular Weight |
62.302 g/mol |
|
Structure |
Tetragonal, TiO2 Rutile type, space group P42/mnm, ao = 4.623Å, C0 = 3.52Å |
|
Density |
3.177 g/cm3 at 20 °C |
|
Melting Point |
1255 °C |
|
Boiling Point |
2260 °C |
|
Bulk Modulus |
101.3 GPa |
|
Shear Modulus |
54.7 GPa |
|
Young Modulus |
139.0 GPa |
|
Poisson’s Ratio |
0.271 |
|
Elastic Constants Elastic Stiffness (GPa) |
C11 = 123.7 C12 = 73.2 C33= 177.0 C13 = 53.6 C44 = 55.2 C66 = 95.1 |
|
Dielectric Constant |
4.87 along C axis, 5.45 perpendicular be- tween 95KHz and 42MHz |
|
Hardness |
415 Knoop |
Thermal Properties
Heat Capacity
|
T[K] |
Cp [J/g . K)] |
|
80.00 |
0.238 |
|
95.00 |
0.319 |
|
114.00 |
0.428 |
|
135.00 |
0.538 |
|
155.00 |
0.627 |
|
176.00 |
0.706 |
|
196.00 |
0.771 |
|
216.00 |
0.830 |
|
236.00 |
0.877 |
|
256.00 |
0.922 |
|
276.00 |
0.955 |
Thermal Conductivity
|
T[°C] |
[W/(m.K)] |
|
18 |
11.6 |
Linear Thermal Expansion Coefficient
|
T [°C] |
T [K] |
Coefficient [x10-6/K] |
|
|
|
Perp c axis |
Parallel c Axis |
|
|
-180 |
93 |
0.72 |
2.90 |
|
-160 |
113 |
1.63 |
4.45 |
|
-140 |
133 |
2.65 |
5.95 |
|
-120 |
153 |
3.64 |
7.39 |
|
-100 |
173 |
4.58 |
8.86 |
|
-80 |
193 |
5.45 |
9.82 |
|
-60 |
213 |
6.23 |
10.86 |
|
-40 |
233 |
6.93 |
11.74 |
|
-20 |
253 |
7.52 |
12.47 |
|
0 |
273 |
8.04 |
13.07 |
|
20 |
293 |
8.48 |
13.70 |
|
40 |
313 |
8.88 |
14.09 |
|
60 |
333 |
9.25 |
14.54 |
|
80 |
353 |
9.60 |
14.94 |
|
100 |
373 |
9.93 |
15.32 |
|
120 |
393 |
10.22 |
15.67 |
|
140 |
413 |
10.49 |
16.00 |
|
160 |
433 |
10.71 |
16.33 |
|
180 |
453 |
10.91 |
16.67 |
|
200 |
473 |
11.10 |
17.00 |
Optical Properties
|
Transmission Range |
Useful range of 0.11 μm to ~7.50 μm, depending on thickness |
|
Energy Gap |
11eV |
|
Restrahl Frequency |
17.5, 20.8, 24.7, 34.5, and 37.0 μm |
|
Reciprocal Dispersive Power |
100 |
Available Grade and Additional Information
Depending on the application of interest, some or all of the following attributes may be considered in the selection process:
|
Internal transmittance |
>99.0% @ 193.3nm |
|
Stress Birefringence |
Naturally birefringent |
|
Bubbles/Inclusions |
ISO 10110 - 1/1 x 0.02 |
|
Scratch dig |
To 10/5 available |
|
Micro-roughness |
To 2 Å available |
|
Availble raw material diameters |
1.7”, 2.4”, 3.5” and 5” (typical), |
