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Silver iodide (AgI) is a chemical compound used in photography and as an antiseptic in medicine. Silver iodide is highly insoluble in water and has a crystalline structure similar to that of ice, allowing it to induce freezing (heterogeneous nucleation) in cloud seeding for the purpose of rainmaking.
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The crystalline structure adopted by silver iodide changes with temperature. The following phases are known:
Silver iodide as a fast ion conductor
The transition between the β and α forms represents the melting of the silver (cation) sublattice. The entropy of fusion (melting) for α-AgI is approximately half that for sodium chloride (a typical ionic solid). This can be rationalised by noting that the AgI crystalline lattice has essentially already partly melted in the transition between α and β forms. Adding the entropy of transition from α-AgI to β-AgI to the entropy of fusion gives a value that is much closer to the entropy of fusion for sodium chloride.
In the television series The Batman, Poison Ivy used Silver Iodide to create rain, so that she could populate Gotham City with her new breed of plants, that assisted her in taking over the city.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Silver_iodide". A list of authors is available in Wikipedia.|