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Description
Widely used in photography, silver iodide (AgI) is a chemical compound which is highly insoluble in water and is a fast ion conductor. It is also used as an antiseptic in medicine. Its structure is similar to that of ice, which allows it to induce freezing (heterogeneous nucleation) in cloud seeding for rainmaking purpose.
The crystalline structure of silver iodide changes with temperature. Some of the phases of these changes are as follows:
The crystalline structure of silver iodide changes with temperature. Some of the phases of these changes are as follows:
- Up to 420K (147 ¡ÆC), AgI exists in the ©¬-phase, which has a wurtzite structure
- Above 420K (147 ¡ÆC), AgI undergoes a transition to the ¥á-phase, which has a body-centered cubic structure. Its silver ions are distributed randomly between 2-, 3-, and 4-coordinate sites.
- A metastable ¥ã-phase also exists below 420K, which has a zinc blende structure
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Silver Iodide
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