Characteristic

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 .

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)

                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

Crystal structure：Orthorhombic, oP24

Application

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. 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⁺.