Strontium bromide

Strontium bromide
Names
IUPAC name
Strontium bromide
Identifiers
10476-81-ce N
3D model (Jmol) Interactive image
ChemSpider 23635 YesY
ECHA InfoCard 100.030.868
EC Number 233-969-5
PubChem 25302
Properties
SrBr2
Molar mass 247.428 g/mol (anhydrous)
355.53 g/mol (hexahydrate)
Appearance white crystalline powder
Density 4.216 g/cm3 (anhydrous)
2.386 g/cm3 (hexahydrate)
Melting point 643 °C (1,189 °F; 916 K)
Boiling point 2,146 °C (3,895 °F; 2,419 K)
107 g/100 mL
Solubility soluble in alcohol
insoluble in ether
Structure
tetragonal[1]
Hazards
Main hazards Corrosive
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g., calcium Special hazards (white): no codeNFPA 704 four-colored diamond
0
1
1
Related compounds
Other anions
 strontium fluoride
strontium chloride
strontium iodide
Other cations
 Beryllium bromide
Magnesium bromide
Calcium bromide
Barium bromide
Radium bromide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Strontium bromide is a chemical compound with a formula SrBr2. At room temperature it is a white, odorless, crystalline powder. Strontium bromide burns bright red in a flame test. It is used in flares and also has some pharmaceutical uses.

Structure

At room temperature, strontium bromide adopts a crystal structure with a tetragonal unit cell and space group P4/n. This structure is referred to as α-SrBr2 and is isostructural with EuBr2 and USe2. Around 920 K (650 °C), α-SrBr2 undergoes a first-order solid-solid phase transition to a much less ordered phase, β-SrBr2, which adopts the cubic fluorite structure. The beta phase of strontium bromide has a much higher ionic conductivity of about 1 S cm−1, comparable to that of molten SrBr2, due to extensive disorder in the bromide sublattice.[2] Strontium bromide melts at 930 K (657 °C).

See also

References

  1. ↑ R. L. Sass; et al. (1963). "The crystal structure of strontium bromide". J. Phys. Chem. 67 (12): 2862. doi:10.1021/j100806a516.
  2. ↑ Hull, Stephen; Norberg, Stefan T.; Ahmed, Istaq; Eriksson, Sten G.; Mohn, Chris E. (2011). "High temperature crystal structures and superionic properties of SrCl2, SrBr2, BaCl2 and BaBr2". J. Solid State Chem. 184 (11): 2925–2935. doi:10.1016/j.jssc.2011.09.004.


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