About Silver Iodide

Silver Iodide is an inorganic substance with a chemical formula of AgI. It is a bright yellow odorless microcrystalline powder. There are two types of α and β. . β-type is a hexagonal crystal with a density of 5.683g/cm3, and it turns into α-type when heated to 146°C. Insoluble in dilute acid, water, slightly soluble in ammonia, easily soluble in potassium Iodide, potassium cyanide, sodium thiosulfate and methylamine, regardless of solid or liquid silver iodide, it has photosensitive properties, can sense wavelengths from ultraviolet to about 480 mm light in between.

Under the action of light, it is decomposed into very small particles of "silver core", which gradually become greenish gray-black. When heated with ammonia water, it turns white due to the formation of silver iodide-ammine complex crystals.

Silver iodide has α, β and γ phases. β and γ are relatively stable at room temperature, and the α phase has higher electrical conductivity, but it is difficult to exist at low temperature. The β phase is a hexagonal crystal, and the γ phase is a cubic crystal. Above 146 degrees Celsius, the alpha phase gradually becomes dominant, and it is a body-centered cubic crystal.

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