Strontium iodide

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]

Strontium iodide

Names
IUPAC name Strontium iodide
Identifiers
CAS Number	10476-86-5 (anhydrous) Y
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 Y
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)[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
Occupational safety and health (OHS/OSH):
Main hazards	Corrosive
GHS labelling:[4]
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). N verify (what is YN ?) Infobox references

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]