Magnesium fluoride
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| Magnesium fluoride | |
|---|---|
| Image:Magnesium fluoride.jpg | |
| Systematic name | Magnesium fluoride |
| Other names | xxx, xxx |
| Molecular formula | MgF2 |
| Molar mass | 62.30 g/mol |
| Density | 3.148 g/cm3 |
| Solubility (water) | 0.076 g/l |
| Melting point | 1263 °C |
| Boiling point | 2227 °C |
| CAS number | [7783-40-6] |
| Disclaimer and references | |
Magnesium fluoride (MgF2) is a white crystalline salt composed of one magnesium ion and two fluoride ions, and is used in the electrolysis of aluminium ore. It is a tetragonal, birefringent crystal.
Refractive index at 500 nm: no = 1.37397, ne = 1.3916.
Magnesium fluoride is transparent over an extremely wide range of wavelengths. Windows, lenses, and prisms made of this material can be used over the entire range of wavelenths from 0.140 μm (ultraviolet) to 8.0 μm (infrared). The cost of producing optical elements from this material—as of 2004 one vendor charged nearly $500 for 25-mm diameter magnesium fluoride lenses and windows—limits its use to specialized applications. As an infrared optical material, it is sometimes known by the Eastman Kodak trademark Irtran-1.
Thin layers of MgF2 are frequently applied to the surfaces of optical elements as part of optical coatings such as anti-reflective coatings.
As a mineral, it is known as Sellaite.
[edit] External links
- A java applet showing the effect of MgF2 on a lens
- Infrared windows at Lawrence Berkeley National Laboratory
- National Pollutant Inventory - Fluoride and compounds fact sheet
[edit] External links
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