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  MGF2 CRYSTALS
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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.

Crystal Structure

Tetragonal, space group:P42/mnm; a = 4.621 Å, c = 3.051 Å  

Transmission Range  

0.11-7.5 µm  

Refractive Index  

no = 1.3836, ne = 1.3957 @0.405 µm  

Reflective Loss 

10.61% @0.12 µm, 4.42% @4,0 µm

Reststrahlen  

20.0 µm  

Density  

3.177 g/cm3 @298K

Melting Point  

1255°C  

Molecular Weight  

62.32 

Thermal Conductivity  

|| c: 21 W/(m·K) , ⊥c: 33.6 W/(m·K) @27°C 

Specific Heat  

1130 J/(kg·K) @298K;

Thermal Expansion  

|| c: 8.8´10-6/ºC, ⊥c: 13.7´10-6/ºC @20°C 

Hardness

415, Knoop; 6, Mohs  

Young`s Modulus  

|| c:169.1 GPa, ⊥c: 79.7GPa

Shear Modulus  

|| c:57.1 GPa, ⊥c: 95.2GPa   

Bulk Modulus  

101.32 GPa  

Rupture Modulus  

49.0 MPa  

Elastic Coefficients  

C11=140.2; C12=9.5; C13=62.9; C33=204.7; C44=56.8; C66=95.7 GPa  

Dielectric Constant  

|| c: 4.87, ⊥c: 5.45 @95 KHz – 42 MHz 

Solubility in Water  

0.0076 g / 100g @18°C  

Cleavage Planes  

(110)

Application  

windows, mirrors, lens, prisms, polarizer, wedges and substrates

Remarks  

Max. temperature for application: 500°C 

Poisson Ratio

0.577

Bandgap,

10.8 eV

Damage Threshold

1J/cm2, 8ns at 248nm typical

 
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