Magnesium fluoride

Source: Wikipedia, the free encyclopedia.
Magnesium fluoride[1]
Magnesium fluoride
Names
Other names
Sellaite
Irtran-1
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
100.029.086 Edit this at Wikidata
EC Number
  • 231-995-1
RTECS number
  • OM3325000
UNII
  • InChI=1S/2FH.Mg/h2*1H;/q;;+2/p-2 checkY
    Key: ORUIBWPALBXDOA-UHFFFAOYSA-L checkY
  • InChI=1/2FH.Mg/h2*1H;/q;;+2/p-2
    Key: ORUIBWPALBXDOA-NUQVWONBAK
  • F[Mg]F
  • [Mg+2].[F-].[F-]
Properties
MgF2
Molar mass 62.3018 g/mol
Appearance White
tetragonal
crystals
Density 3.148 g/cm3
Melting point 1,263 °C (2,305 °F; 1,536 K)
Boiling point 2,260 °C (4,100 °F; 2,530 K)
0.013 g/(100 mL)
5.16⋅10−11
Solubility
−22.7⋅10−6 cm3/mol
1.37397
Structure
Rutile (tetragonal), tP6
P42/mnm, No. 136
Thermochemistry
61.6 J⋅mol−1⋅K−1
57.2 J⋅mol−1⋅K−1
Std enthalpy of
formation
fH298)
−1124.2 kJ⋅mol−1
−1071 kJ/mol
Hazards[2][3]
GHS labelling:
Irritant
Warning
H303, H315, H319, H335
P261, P304+P340, P305+P351+P338, P405
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
3
0
0
Lethal dose or concentration (LD, LC):
2330[clarification needed] (rat, oral)
Safety data sheet (SDS) ChemicalBook
Related compounds
Other anions
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Magnesium fluoride is an ionically bonded inorganic compound with the formula MgF2. The compound is a white crystalline salt and is transparent over a wide range of wavelengths, with commercial uses in optics that are also used in space telescopes. It occurs naturally as the rare mineral sellaite.

Production

Magnesium fluoride is prepared from magnesium oxide with sources of hydrogen fluoride such as ammonium bifluoride:

MgO + [NH4]HF2 → MgF2 + NH3 + H2O

Related metathesis reactions are also feasible:

Mg(OH)2 + CuF2 → MgF2 + Cu(OH)2

Structure

The compound crystallizes as

anions.[6]

Coordination geometry in magnesium fluoride[7]
Magnesium coordination Fluorine coordination

In the gas phase,

Uses

Optics

Magnesium fluoride is

Lyman alpha). Lower-grade magnesium fluoride is inferior to calcium fluoride in the infrared range.[citation needed
]

Magnesium fluoride is tough and polishes well but is slightly

arcminG−1⋅cm−1 at 632.8 nm.[8]

Safety

Chronic exposure to magnesium fluoride may affect the skeleton, kidneys, central nervous system, respiratory system, eyes and skin, and may cause or aggravate attacks of asthma.[9]

References

  1. ^ W.M. Haynes, ed. (2016), "Physical Constants of Inorganic Compounds", Handbook of Chemistry and Physics (97th ed.), CRC Press, pp. 4–71 (789),
  2. ^ "Magnesium Fluoride Material Safety Data Sheet". Science Labs. May 21, 2013. Retrieved October 13, 2017.
  3. ^ "Magnesium fluoride". CAS DataBase List. ChemicalBook. Retrieved October 13, 2017.
  4. ^ .
  5. ^ .
  6. ^ .
  7. .
  8. ^ "Magnesium Fluoride Material Safety Data Sheet". ESPI Metals. August 2004. Archived from the original on 2017-10-28. Retrieved October 13, 2017.

External links