Strontium iodide

Strontium iodide
Names
	IUPAC name Strontium iodide
Identifiers
CAS Number	10476-86-5 (anhydrous) ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	23637;
ECHA InfoCard	100.030.871
EC Number	233-972-1;
PubChem CID	25304;
RTECS number	WK9275000;
UNII	F6V5HOR0O5 ;
CompTox Dashboard (EPA)	DTXSID10909176 ;
	InChI InChI=1S/2HI.Sr/h2*1H;/q;;+2/p-2;
	SMILES I[Sr]I; [Sr+2].[I-].[I-];
Properties
Chemical formula	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); 4.40 g/cm3 (hexahydrate)
Melting point	507 to 645 °C (945 to 1,193 °F; 780 to 918 K)
Boiling point	1,773 °C (3,223 °F; 2,046 K) (decomposes)
Solubility in water	177.0 g/100 mL (20 °C)
Solubility in ethanol	3.1 g/100 ml (4 °C)
Magnetic susceptibility (χ)	−112.0·10−6 cm3/mol
Structure
Crystal structure	Orthorhombic, oP24
Space group	Pbca, No. 61
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	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). verify (what is ?) Infobox references

Strontium iodide is an inorganic compound with the chemical formula Sr I₂. 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

^ ^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

[yaws-1] Yaws, C.L. (2008). Thermophysical properties of chemicals and hydrocarbons. William Andrew. ISBN 978-0-8155-1596-8.

[Seidell-2] 
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

[PrettymanBurger2015-6] 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

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