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    MgF2(Magnesium Fluoride)
    Product Information :

    Magnesium Fluoride is used for optical elements in the infrared where extreme ruggedness and durability is required. Its useful transmission range is 0.11 μm - 7.5 μm. Irradiation does not lead to color centers. Magnesium fluoride is a rugged, hard material which is resistant to thermal and mechanical shock. Considerable mechanical shock is needed to cause cleavage which is near perfect when it occurs. The natural form of MgF2 is known as Sellaite. Magnesium fluoride is a positive birefringent crystal grown normally to 135 mm diameter by vacuum Stockbager technique, seeding along the C-axis.

    OPTICAL
    Transmission Range........................................ 0.11 to 7.5 microns
    Refractive Index............ N0=1.3836 Ne=1.3957 at 0.405 microns
    Reflection Loss ........................11.2% at 0.12 microns (2 surfaces)
    Restrahlen Peak ....................................................20 microns
    dN/dT ..................+2.3 and +1.7 x 10-6e/ °C at 0.4 microns

    PHYSICAL
    Density............................................ 3.177 g/cm3
    Melting Point ...................................1255 °C
    Thermal Co.......................... 0.3 W/(m K) at 27 °C
    Thermal Expansion .............................13.7and 8.48 x 10-6e/ °C
    Hardness Knoop ..................................................................415 kg/mm2
    Specific Heat Capacity, cal/(g K)........... 0.24 at 298 K, 0.362 at 1700 K
    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 GPa
    Elastic Coefficients................C11=140.2 C12=89.5 C44=56.8
    .............................................C33=204.7 C13=62.9 C66=95.7
    Apparent Elastic Limit..................................... 49.64 MPa
    Poisson Ratio........................................................ 0.276

    CHEMICAL
    Solubility .............................................<0.0002 g/100g water at 0 °C
    Molecular Weight....................................... 62.32
    Class/Structure ...........................................Tetragonal, can cleave on C-axis


       
       
     
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