SILVER IODIDE[AgI]

CAS Number 7783-96-2

·         Empirical Formula (Hill Notation) AgI

·         Molecular Weight 234.77

·          EC Number 232-038-0

·          MDL number MFCD00003412

·          PubChem Substance ID 329752335

Silver iodide is an inorganic compound with the formula AgI. The compound is a bright yellow solid, but samples almost always contain impurities of metallic silver that give a gray coloration. 
Detailed d

The silver contamination arises because AgI is highly photosensitive. This property is exploited in silver-based photography. Silver iodide is also used as an antiseptic and in cloud seeding.

Structure

The structure adopted by silver iodide is temperature dependent:

·         Below 420 K, the β-phase of AgI, with the wurtzite structure, is most stable. This phase is encountered in nature as the mineral iodargyrite.

·         Above 420 K, the α-phase becomes more stable. This motif is a body-centered cubic structure which has the silver centers distributed randomly between 6 octahedral, 12 tetrahedral and 24 trigonal sites.^[3] At this temperature, Ag⁺ ions can move rapidly through the solid, allowing fast ion conduction. The transition between the β and α forms represents the melting of the silver (cation) sublattice. The entropy of fusion for α-AgI is approximately half that for sodium chloride (a typical ionic solid). This can be rationalized by considering the AgI crystalline lattice to have already "partly melted" in the transition between α and β polymorphs.

·         A metastable γ-phase also exists below 420 K with the zinc blende structure.

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