MSE PRO Magnesium Fluoride MgF2 Crystal Substrates

SKU: SU0621

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Magnesium Fluoride crystals are optically transparent well into the VUV region to the hydrogen Lyman-alpha line (121nm) and beyond. Magnesium Fluoride is used mostly for UV optics and is excellent for excimer laser applications.

For bulk and customized MgF2 crystals, please contact us for a quote. 

Magnesium Fluoride Crystal Substrates Properties

Chemical Formula


CAS Number 7783-40-6
Crystal Structure
Tetragonal, Rutile structure, P42/mnm

Lattice Constant

a=b=4.6213Å, c=3.0519Å

Crystal Orientation (100), (001), (110), (111)

10x10x0.5mm, 10x10x1.0mm,

1 inch diameter, 2 inch diameter, other sizes are available upon request

Surface Polish

Single side polished (SSP) or Double side polished (DSP)

Molecular Weight

62.30 g/mol


colorless solid

Melting Point

1255 °C


3.18 g/cm3

Solubility in H2O

0.0002g /100g water at 20 oC

Poisson's Ratio


Specific Heat

1003 J Kg m-1 K-1

Thermal Conductivity

21 (parallel to C axis) W m-1 K-1 at 300K

33.6 (perpendicular to C axis) W m-1 K-1 at 300K

Thermal Expansion Coefficient

13.7x10-6 oC, parallel to C axis

8.9x10-6oC, perpendicular to C axis

Young's Modulus

138 GPa

Refractive Index


Transmission Range 0.12 to 7 μm