Strontium iodide

Strontium iodide
Names
IUPAC name
Strontium iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.871 Edit this at Wikidata
EC Number
  • 233-972-1
RTECS number
  • WK9275000
UNII
  • InChI=1S/2HI.Sr/h2*1H;/q;;+2/p-2
  • I[Sr]I
  • [Sr+2].[I-].[I-]
Properties
SrI2 (anhydrous)
SrI2·6H2O (hexahydrate)
Molar mass 341.43 g·mol−1 (anhydrous)
Appearance Colorless to white crystalline plates
Density 4.55 g/cm3 (anhydrous)[1]
4.40 g/cm3 (hexahydrate)[1]
Melting point 507 to 645 °C (945 to 1,193 °F; 780 to 918 K)[3]
Boiling point 1,773 °C (3,223 °F; 2,046 K) (decomposes)
177.0 g/100 mL (20 °C)[2]
Solubility in ethanol 3.1 g/100 ml (4 °C) [2]
−112.0·10−6 cm3/mol
Structure
Orthorhombic, oP24
Pbca, No. 61
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Corrosive
GHS labelling:[4]
GHS05: Corrosive
Danger
H314
P280, P305+P351+P338, P310
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 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
1
0
0
Related compounds
Other anions
 strontium fluoride
strontium chloride
strontium bromide
Other cations
 beryllium iodide
magnesium iodide
calcium iodide
barium iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Strontium iodide is an inorganic compound with the chemical formula SrI2. It is a salt of strontium and iodine. It forms a hexahydrate SrI2·6H2O. It is an ionic, water-soluble, and deliquescent compound that can be used in medicine as a substitute for potassium iodide.[5] It is also used as a scintillation gamma radiation detector, typically doped with europium, due to its optical clarity, relatively high density, high effective atomic number (Z=48), and high scintillation light yield.[6] In recent years, europium-doped strontium iodide (SrI2:Eu2+) has emerged as a promising scintillation material for gamma-ray spectroscopy with extremely high light yield and proportional response, exceeding that of the widely used high performance commercial scintillator LaBr3:Ce3+. Large diameter SrI2 crystals can be grown reliably using vertical Bridgman technique [7] and are being commercialized by several companies.[8][9]

Reactions

Strontium iodide can be prepared by reacting strontium carbonate with hydroiodic acid:

SrCO3 + 2 HI(aq) → SrI2 + H2O + CO2

Strontium iodide forms a white powder that slowly changes to a yellowish colour when exposed to air. At high temperatures (in the presence of air) strontium iodide completely decomposes to form strontium oxide and free iodine.[10]

References

  1. ^ a b Yaws, C.L. (2008). Thermophysical properties of chemicals and hydrocarbons. William Andrew. ISBN 978-0-8155-1596-8.
  2. ^ a b
    177 g/100 mL (20 °C)Seidell, Atherton (1907), Solubilities of Inorganic and Organic Substances, New York: D. Van Nostrand, p. 318, retrieved 2007-12-10
  3. ^ Turner, Jr., Francis M., ed. (1920), The Condensed Chemical Dictionary, New York: The Chemical Catalog Company, p. 449, retrieved 2007-12-10
  4. ^ "Strontium iodide". Sigma Aldrich.
  5. ^ Shoemaker, John V. (1908), A Practical Treatise on Materia Medica and Therapeutics (7th ed.), Philadelphia: F. A. Davis, p. 854, retrieved 2007-12-10
  6. ^ Prettyman, Thomas; Burger, Arnold; Yamashita, Naoyuki; Lambert, James; Stassun, Keivan; Raymond, Carol (2015). "Ultra-bright scintillators for planetary gamma-ray spectroscopy". SPIE Newsroom. doi:10.1117/2.1201510.006162. ISSN 1818-2259.
  7. ^ Datta, A.; Lam, S.; Swider, S.; Motakef, S. (October 2016). "Crystal growth of large diameter strontium iodide scintillators using in Situ stoichiometry monitoring". 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD). pp. 1–4. doi:10.1109/NSSMIC.2016.8116640. ISBN 978-1-5090-1642-6. S2CID 31775311.
  8. ^ Inc., CapeSym. "CapeSym | SrI2(Eu)". www.capesym.com. Retrieved 2018-02-13. {{cite web}}: |last= has generic name (help)
  9. ^ "Strontium Iodide | RMD". rmdinc.com. Archived from the original on 2018-02-14. Retrieved 2018-02-13.
  10. ^ Bartley, Elias H. (1898), Text-book of Medical and Pharmaceutical Chemistry (5th ed.), Philadelphia: P. Blakiston, pp. 267–268, retrieved 2007-12-10