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General Ruby and Sapphire - Optics, Jewel Bearings, Electronic Parts and Wear Parts

Home | Magnesium Fluoride (MgF2)

Magnesium Fluoride (MgF2)

Magnesium Fluoride (MgF2)

APPLICATIONS: UV and Vacuum UV windows. lenses. polarisers.

Properties

Optical Properties

Transmission Range 0.11 to 7.5 microns
Refractive Index NO = 1.3836 Ne = 1.3957 at 0.405 microns
Reflection Loss 11.2% at 0.12 microns(2 surfaces)
Restrahelen Peak 20 microns
dN/dT +2.3 and + 1.7 x 10-6/oe at 0.4 microns

Physical Properties

Density 3.177gm/cc
Melting Point 1255°C
Thermal Conductivity 0.3 Wm-l° K-1 at 27°C
Thermal Expansion 13.7 and 8.48 x 10-6/°C
Hardness Knoop 415
Specific Heat Capacity  
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 Qpa
Elastic Coefficients Cl1=140.2
C12=89.5
C44=56.8 0
C33 = 204.7
C13= 62.9
C66 = 95.7
Apparent Elastic Limit 49.64 Mpa
Poisson Ratio 0.276

Chemical Properties

Solubility <0.0002 gm/100gm water at O°C
Molecular Weight 62.32
Class/Structure Tetragonal. can cleave on C-axis

Index of Refraction

0.118 microns

1.6800

0.121 microns 1.62
0.130 microns 1.556
0.140 microns 1.509
0.150 microns 1.480
0.170 microns 1.447
0.180 microns 1.439
0.200 microns l.422
0.3 microns l.40
0.7 microns 1.376