The Melting Point of Magnesium Fluoride (MgF2)


Mar 17, 2023

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Magnesium Fluoride (MgF2) is a colorless and durable crystalline material, which is used in vacuum ultraviolet and excimer laser windows. It is a tetragonal birefringent crystal and has good optical properties. It can be used as a focusing mirror in deep ultraviolet and excimer lasers.

Its ionic character has a positive charge on magnesium and a negative one on oxide, which results in a high melting point because it is an ionic compound with strong electrostatic attractions between the ions. Therefore, a lot of energy is required to break these attractions and change the compound from a solid to a liquid state.

The ionic nature of MgF2 is an important property that affects its dimensional stability, electrolyte leakage, ionic conductivity and mechanical strength of the electrolyte-filler pellets. In this paper, we characterized the MgF2-MgO system calcined at 500 and 600 degC.

We found that the impregnation of MgO with MgF2 significantly improved the mechanical strength and ionic conductivity of the electrolyte-filler. However, a deterioration in the absorbability occurred when the initial calcination temperature of the filler increased. In addition, the surface area of the MgF2/MgO system was several times lower compared to bare MgO. This reduction could be attributed to the formation of a layer of MgF2 on the MgO surface. Moreover, MgF2 did not absorb carbon dioxide in contrast to MgO which easily absorbs CO2. The MgF2-MgO system was also more stable than the bare MgO and 10 MF systems under pressure 60 kPa and temperature 400 degC.