Strontium iodide

Strontium iodide
Names
	IUPAC name Strontium iodide
Identifiers
CAS Number	10476-86-5 (anhydrous) ;
3D model (JSmol)	Interactive image;
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 [Sr+2].[I-].[I-];
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)[2]
Boiling point	1,773 °C (3,223 °F; 2,046 K) (decomposes)
Solubility in water	177.0 g/100 mL (20 °C)[3]
Solubility in ethanol	3.1 g/100 ml (4 °C) [3]
Magnetic susceptibility (χ)	−112.0·10−6 cm3/mol
Structure
Crystal structure	Orthorhombic, oP24
Space group	Pbca, No. 61
Hazards
Main hazards	Corrosive
R-phrases (outdated)	R14 R34
S-phrases (outdated)	S22 S26 S27 S36/37/39S45 [4]
NFPA 704 (fire diamond)	0 1 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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	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]

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

Yaws, C.L. (2008). Thermophysical properties of chemicals and hydrocarbons. William Andrew. ISBN 978-0-8155-1596-8.
Turner, Jr., Francis M., ed. (1920), The Condensed Chemical Dictionary, New York: The Chemical Catalog Company, p. 449, retrieved 2007-12-10
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
400696 Strontium iodide anhydrous, beads, −10 mesh, 99.99+ %
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): 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.
"Strontium Iodide | RMD". rmdinc.com. 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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[yaws-1] Yaws, C.L. (2008). Thermophysical properties of chemicals and hydrocarbons. William Andrew. ISBN 978-0-8155-1596-8.

[2] Turner, Jr., Francis M., ed. (1920), The Condensed Chemical Dictionary, New York: The Chemical Catalog Company, p. 449, retrieved 2007-12-10

[Seidell-3] 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

[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

[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): 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.

[9] "Strontium Iodide | RMD". rmdinc.com. 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