
Cesium iodide (CAS 7789-17-5), with the molecular formula C₈I, is a white crystalline powder. It is stable at room temperature, readily absorbs moisture, and is highly soluble in water and ethanol. Its aqueous solution is neutral, and it exhibits excellent optical and electrical conductivity. It is primarily used as a raw material for scintillation crystals, a reagent for spectroscopic analysis, an optical material, and an additive in the electronics industry.
| Item | Specification |
| Melting Point | 621 °C |
| Boiling Point | 1280 °C |
| Density | 4.51 g/cm³ |
| Flash Point | N/A |
| Vapor pressure | 10⁻⁴ mmHg (25°C), extremely low |
| Refractive index | 1.788 |
| Solubility | Easily soluble in water and ethanol |
| Sensitivity | Hygroscopic; less so than sodium iodide; must be protected from moisture. |
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