Magnesiumfluorid Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
Magnesium fluoride (MgF₂) is a white crystalline salt that exhibits faint purple fluorescence under ultraviolet light. It is soluble in nitric acid and sparingly soluble in water and ethanol. It is used in the electrolysis of aluminum ore to produce metallic aluminum and also as a reflective coating on various types of optical components. It is a tetragonal, birefringent crystal with the TiO2 type of structure.
Charakteristisch
Magnesium fluoride (MgF₂) is a tetragonal crystal with a rutile-type structure, having lattice parameters of a = 4.64 Å and c = 3.06 Å. Its point group is 4/mmm, and its space group is P4₂/mnm. When exposed to ultraviolet radiation or electron-beam excitation, it exhibits faint purple fluorescence. MgF₂ crystals possess excellent optical and polarising properties, making them particularly suitable for ultraviolet and infrared spectroscopy. They are transparent over a broad wavelength range (110 nm–7.5 μm) and are therefore widely used in space telescope optics. Single crystals are also employed in vacuum-ultraviolet-transparent windows, polarising prisms, and optical lenses.
Magnesium fluoride thin films exhibit a low refractive index (n ≈ 1.38), a broad transmission range (120–8,000 nm), a wide bandgap (≈11 eV), excellent thermal stability, high mechanical strength, and a high laser-induced damage threshold. These properties make MgF₂ an important material for the fabrication of anti-reflective coatings, high-reflectivity coatings, and high-damage-threshold optical coatings. Consequently, MgF₂ thin films are widely used in a variety of optical coating applications.
Verwenden
Suitable for vacuum deposition. Magnesium fluoride occurs in nature as the mineral, sellaite. It is used in
glass and ceramics. Single crystals are used for polarizing prisms and lenses.
synthetische
Magnesium fluoride is a colorless salt with the rutile structure. It is formed by reaction of magnesium oxide and HF or magnesium carbonate and NH4F·HF. It is also a by product from the manufacture of elements such as beryllium by reduction of the corresponding fluoride by magnesium metal.
Hazard
Strong irritant. TLV: 2.5 mg(F)/m3.
Sicherheitsprofil
Moderately toxic by
ingestion. When heated to decomposition it
emits toxic fumes of F-. See also
MAGNESIUM and FLUORIDES.
Magnesiumfluorid Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
