MgF2 Crystals
Magnesium Fluoride (MgF2) crystal is harder and tougher than Calcium Fluoride (CaF2), but relatively soft and somewhat hygroscopic compared with Fused Silica. And it is good to resistant to mechanical and thermal shock, to radiation, and is chemically stable.
Magnesium Fluoride is grown by vacuum Bridgman-Stockbarger technique in ingots of various diameters, but 100mm is standard we provide. We can supply high quality Magnesium Fluoride single crystals of VUV and IR grade MgF2 material.
We can provide windows, mirrors, lens, prisms, polarizer, wedges， substrates and other optical components according to customers’ specifications and drawings.
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Crystal Structure |
Tetragonal, space group:P42/mnm; a = 4.621 Å, c = 3.051 Å |
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Transmission Range |
0.11-7.5 µm |
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Refractive Index |
no = 1.3836, ne = 1.3957 @0.405 µm |
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Reflective Loss |
10.61% @0.12 µm, 4.42% @4,0 µm |
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Reststrahlen |
20.0 µm |
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Density |
3.177 g/cm3 @298K |
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Melting Point |
1255°C |
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Molecular Weight |
62.32 |
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Thermal Conductivity |
|| c: 21 W/(m·K) , ⊥c: 33.6 W/(m·K) @27°C |
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Specific Heat |
1130 J/(kg·K) @298K; |
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Thermal Expansion |
|| c: 8.8´10-6/ºC, ⊥c: 13.7´10-6/ºC @20°C |
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Hardness |
415, Knoop; 6, Mohs |
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Young`s Modulus |
|| c:169.1 GPa, ⊥c: 79.7GPa |
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Shear Modulus |
|| c:57.1 GPa, ⊥c: 95.2GPa |
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Bulk Modulus |
101.32 GPa |
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Rupture Modulus |
49.0 MPa |
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Elastic Coefficients |
C11=140.2; C12=9.5; C13=62.9; C33=204.7; C44=56.8; C66=95.7 GPa |
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Dielectric Constant |
|| c: 4.87, ⊥c: 5.45 @95 KHz – 42 MHz |
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Solubility in Water |
0.0076 g / 100g @18°C |
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Cleavage Planes |
(110) |
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Application |
windows, mirrors, lens, prisms, polarizer, wedges and substrates |
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Remarks |
Max. temperature for application: 500°C |
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Poisson Ratio |
0.577 |
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Bandgap, |
10.8 eV |
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Damage Threshold |
1J/cm2, 8ns at 248nm typical | |
