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Magnesium fluoride is a white crystalline salt, which is commonly used to produce aluminum oxide and as a reflective coating on many different types of optical components. It has a characteristic tetragonal crystal structure which is slightly birefringent.
It has a relatively low chemical reactivity, making it suitable for many applications, e.g. stable permanent films to alter the light transmission properties of optical and electronic materials.
The mgf2 boiling point is similar to those of other crystalline salts, such as magnesium hydroxide (Mg(OH)2) and sodium chloride (NaCl). However, it has the advantage that it is more stable than its more reactive cousins.
MgF2 has a high refractive index, so it can be deposited using sol-gel processes on thermally unstable polymers with peak transmittances of more than 99%. This makes it a suitable material for antireflective coatings on thermally conductive substrates.
It is also very tolerant to harsh environmental conditions, which is why it is often used for polarized corrective lenses in eyeglasses and windows. This makes it an ideal material for solar filters and abrasion resistant coatings in optical devices.
Aqueous fluorolytic processing yields MgF2 precipitates with different morphologies, which can be incorporated into liquid precursor solutions for the preparation of porous antireflective coatings. These products are essentially soluble in water, and their primary particle sizes exceed 100 nm.
By incorporating Na into the precursor solution, the MgF2 film is stabilized against dissolution in liquid H2O. This may be due to a decrease in solubility of the MgF2 particles that are induced by the presence of Na. Additionally, solvothermal treatment of the precursor solution induces MgF2 crystallization, and larger grain sizes are maintained throughout the thermal process.