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Strontium fluoride

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Strontium fluoride
Strontium Fluoride model.pngStrontium fluoride structure.jpg
General
Systematic name Strontium difluoride
Other names Strontium fluoride, Strontium (II) fluoride
Molecular formula F2Sr
Molar mass 125.902419 g/mol
Appearance

colorless crystal or whitish powder;
silvery-white solid metal

CAS number 7783-48-4
Properties [1]
Density and phase Density::4.24 g/cm3, solid
Solubility in water 0.012g/100g water at 27°C
Melting point 1450°C
Boiling point 2460°C
Structure
Coordination
geometry
bent 120°
Crystal structure cubic, cF12
Hazards [2]
MSDS Material safety data sheet
Main hazards

highly poisonous if ingested or inhaled;
skin and eye irritant

Flash point Non-flamable
R/S statement R: 36/37/38
S: 26-36
RTECS number WK8925000
Related compounds[3]
Other anions Strontium chloride,
Strontium bromide,
Strontium iodide
Other cations Barium fluoride,
Beryllium fluoride,
Calcium fluoride,
Magnesium fluoride
Related compounds Strontium, Hydrofluoric acid
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Disclaimer and references

Strontium fluoride is an inorganic, man-made compound consisting of two fluorine atoms and one strontium atom at a 120° bent shape. This insoluable compound is highly toxic and should not be ingested or inhaled. Those who handle strontium fluoride should take caution with eye protection and gloves. Strontium fluoride has high boiling and melting points and is not flammable. It can be made through electrosynthesis using fluorine gas combined with strontium chlorides or hydrofluoric acid. Strontium fluoride is used to coat lenses to transmit infrared waves and ultraviolet waves. This application is used with glasses, prism, windows, and other lenses. The element strontium was discovered in 1787 by William Cruickshank and Adair Crawford as strontium chloride and finally isolated in 1808 by Humphry Davy. The element fluorine was discovered in 1529 by Georgius Agricola and isolated in 1886 by Henri Moissan.


Properties

Strontium fluoride occurs as a white powder or a brittle, colorless crystal. It is not easily soluble, meaning it cannot dissolve in water, at 0.012 grams per 100 grams water at 27°C under normal conditions. It is poisonous if inhaled or ingested and can cause irritation to skin and eyes. Gloves and protective eyewear should always be worn when handling strontium fluoride. This compound has high boiling and melting point, at 2460°C (4460°F) and 1450°C (2642°F), respectively. [1] [2]

Synthesis

Colorless strontium fluoride crystals

Strontium fluoride is a man-made compound produced through electrosynthesis using either fluorine gas or hydrofluoric acid and strontium chloride, resulting in strontium fluoride and chlorine.[4]

SrCl2(s) + F2(g) → SrF2(s)

Uses

Strontium fluoride is mainly used in the optical field, most commonly coated onto lenses, including lenses used for glasses because of its ability to transmit ultraviolet and infrared waves. It is also used to make prisms and windows also for its transmittance abilities. Strontium fluoride is able to carry strontium-90 radioisotopes to radioisotope thermoelectric generators because of its superionic conductivity. As with most fluoride compounds, strontium fluoride is utilized when refining oil and producing pharmaceuticals. [5] [2]

History

Whitish strontium fluoride powder

Strontium was discovered in Strontian (meaning strong man), Scotland as strontianite (SrCO3) in 1787 by William Cruickshank and Adair Crawford in a lead mine. Its first name was strontianite, after the mineral, then switched to strontites by Thomas Charles Hope. During the reveal of its isolation in 1808, Humphry Davy renamed it strontium, to match the other alkaline metals. During the 1950s and 1960s, strontium-90 was used for nuclear weapon testing. [6]

Fluorine was discovered in 1529 by Georgius Agricola to be used during smelting. Fluorite, its original name, consisted of calcium fluoride. The Latin word fluores, means to flow, and the Greek phthorios means destructive. Through electrolysis, Henri Moissan isolated fluorine in 1886.[7]


Video

About the history of strontium

How scientist pinpoint the location a human lived by calculating strontium levels in teeth

References

  1. 1.0 1.1 Strontium(II) fluoride ChemSpider. Web. Accessed April 18, 2016. Author unknown.
  2. 2.0 2.1 2.2 Strontium Fluoride American Elements. Web. Accessed April 18, 2016. Author unknown
  3. Strontium Fluoride PubChem- Open Chemistry Database . Web. Accessed April 26, 2016. Author unknown.
  4. Strontium: Strontium Fluoride Web Elements. Web. Accessed April 26, 2016. Author Unknown.
  5. Strontium New Metals & Chemicals Ltd.. Web. Accessed May 1, 2016. No author. The Newmet Koch website is no longer running and was accessed using Internet Archive.
  6. The Element Strontium Jefferson Lab. Web. Accessed May 1, 2016. Author unknown.
  7. The Element Fluorine Jefferson Lab. Web. Accessed May 1, 2016. Author unknown.