Strontium iodide
Names | |
---|---|
IUPAC name Strontium iodide | |
Identifiers | |
| |
3D model (JSmol) | |
ChemSpider | |
ECHA InfoCard | 100.030.871 |
EC Number |
|
PubChem CID | |
RTECS number |
|
UNII | |
CompTox Dashboard (EPA) | |
| |
| |
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] | |
Danger | |
H314 | |
P280, P305+P351+P338, P310 | |
NFPA 704 (fire 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). |
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
[edit]Strontium iodide can be prepared by reacting strontium carbonate with hydroiodic acid:
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
[edit]- ^ 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