Strontium iodide
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| IUPAC name Strontium iodide | |
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| ECHA InfoCard | 100.030.871  |
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| Properties | |
Chemical formula | 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) |
Solubility in water | 177.0 g/100 mL (20 °C)[2] |
| Solubility in ethanol | 3.1 g/100 ml (4 °C) [2] |
Magnetic susceptibility (χ) | −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] | |
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| Danger | |
| H314 | |
| P280, P305+P351+P338, P310 | |
| NFPA 704 (fire diamond) |  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).  N verify (what is  Y N ?) Infobox references | |
Chemical compound
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]
Reactions
Strontium iodide can be prepared by reacting strontium carbonate with hydroiodic acid:
- SrCO3 + 2 HI → 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
- ^ a b Yaws, C.L. (2008). Thermophysical properties of chemicals and hydrocarbons. William Andrew. ISBN 978-0-8155-1596-8.
- ^ 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 - ^ Turner, Jr., Francis M., ed. (1920), The Condensed Chemical Dictionary, New York: The Chemical Catalog Company, p. 449, retrieved 2007-12-10
- ^ "Strontium iodide". Sigma Aldrich.
- ^ Shoemaker, John V. (1908), A Practical Treatise on Materia Medica and Therapeutics (7th ed.), Philadelphia: F. A. Davis, p. 854, retrieved 2007-12-10
- ^ 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.
- ^ 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.
- ^ Inc., CapeSym. "CapeSym | SrI2(Eu)". www.capesym.com. Retrieved 2018-02-13.
{{cite web}}:|last=has generic name (help) - ^ "Strontium Iodide | RMD". rmdinc.com. Archived from the original on 2018-02-14. Retrieved 2018-02-13.
- ^ Bartley, Elias H. (1898), Text-book of Medical and Pharmaceutical Chemistry (5th ed.), Philadelphia: P. Blakiston, pp. 267–268, retrieved 2007-12-10
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