Strontium iodide

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Strontium iodide
IUPAC name
Strontium iodide
3D model (JSmol)
ECHA InfoCard 100.030.871
EC Number 233-972-1
RTECS number WK9275000
SrI2 (anhydrous)
SrI2·6H2O (hexahydrate)
Molar mass 341.43 g/mol (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
Orthorhombic, oP24
Pbca, No. 61
Main hazards Corrosive
R-phrases (outdated) R14 R34
S-phrases (outdated) S22 S26 S27 S36/37/39S45 [4]
NFPA 704
Flammability code 0: Will not burn. E.g., waterHealth code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentineReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogenSpecial hazards (white): no codeNFPA 704 four-colored diamond
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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Infobox references

Strontium iodide (SrI2) is a salt of strontium and iodine. 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].


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

SrCO3 + 2 HI → SrI2 + H2O + CO2

Strontium iodide yellows when exposed to air. At high temperatures (when in the presence of air) strontium iodide completely decomposes to form strontium oxide and free iodine.[10]


  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. ^ 400696 Strontium iodide anhydrous, beads, −10 mesh, 99.99+ %
  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): 1–4. doi:10.1109/NSSMIC.2016.8116640.
  8. ^ Inc., CapeSym,. "CapeSym | SrI2(Eu)". Retrieved 2018-02-13.
  9. ^ "Strontium Iodide | RMD". 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