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Encyclopedia > Silver iodide
Silver iodide
Image:Silver iodide.jpg
General
Other names Silver(I) iodide
Molecular formula AgI
Molar mass 234.773 g/mol
Appearance yellow, crystalline solid
CAS number [7783-96-2]
Properties
Density and phase 5.675 g/cm3, solid
Solubility in water 3x10-7g/100mL (20 °C)
Melting point 552°C
Boiling point 1506°C
Hazards
EU classification not listed
NFPA 704 Image:nfpa_h2.png Image:nfpa_f0.png Image:nfpa_r0.png
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Silver iodide (AgI) is a chemical compound used in photography, an antiseptic in medicine, rainmaking and cloud seeding. A chemical formula (also called molecular formula) is a concise way of expressing information about the atoms that constitute a particular chemical compound. ... Molar mass is the mass of one mole of a chemical element or chemical compound. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... It has been suggested that this article or section be merged with Solution. ... Water has the chemical formula of H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom. ... The melting point of a solid is the temperature at which it changes state from solid to liquid. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... Council Directive 67/548/EEC of 27 June 1967 on the approximation of laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (as amended) is the main source of European Union law concerning chemical safety. ... NFPA 704 is a standard maintained by the U.S. National Fire Protection Association. ... Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ... General Name, Symbol, Number iodine, I, 53 Chemical series halogens Group, Period, Block 17, 5, p Appearance violet-dark gray, lustrous Atomic mass 126. ... A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition. ... Photography is the process of making pictures by means of the action of light. ... An antiseptic (Greek αντι, against, and σηπτικος, putrefactive) is a substance that prevents the growth and reproduction of various microorganisms (such as bacteria, fungi, protozoa, and viruses) on the external surfaces of the body. ... Rainmaking refers to the act of attempting to artificially induce or increase precipitation, usually to stave off drought. ... Cloud seeding, also known as weather modification, is the attempt to change the amount or type of precipitation that falls out of clouds, or their structure, by dispersing substances into the air which allow water droplets or ice crystals to form more easily. ...


The crystalline structure adopted by silver iodide changes with temperature. The following phases are known:[1] In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ...

  • Up to 420K (147 °C), AgI exists in the β-phase, which has a wurtzite structure.
  • Above 420K (147 °C), AgI undergoes a transition to the α-phase, which has a body-centered cubic structure and has the silver ions distributed randomly between 2-, 3-, and 4-coordinate sites.
  • A metastable γ-phase also exists below 420K, which has a zinc blende structure.

Zinc sulfide is a chemical compound with the formula ZnS. Zinc sulfide is a white to yellow colored powder or crystal. ... Sphalerite sample Another sphalerite sample Sphalerite (ZnS) is a mineral that is the chief ore of zinc. ...

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: Also known as solid electrolytes, fast ion conductors conduct due to the movement of ions through voids in their crystal lattice. ... The Entropy of fusion of a substance represents the increase in the degree of disorder involved in the transition from an organized crystalline solid to the disorganized structure of a liquid. ... Sodium chloride, also known as common salt, table salt, or halite, is a chemical compound with the formula NaCl. ...


References

  1. ^ Binner, J. G. P., Dimitrakis, G.; Price, D. M.; Reading, M.; Vaidhyanathan, B. (2006). "Hysteresis in the β–α Phase Transition in Silver Iodide" (pdf). Journal of Thermal Analysis and Calorimetry 84: 409–412.

PDF is an abbreviation with several meanings: Portable Document Format Post-doctoral fellowship Probability density function There also is an electronic design automation company named PDF Solutions. ...

External links

  • A commercial site (Vista Chemicals) regarding silver iodide
  • Link page to external chemical sources.

  Results from FactBites:
 
Silver - Wikipedia, the free encyclopedia (1639 words)
Silver is a chemical element in the periodic table that has the symbol Ag (from the traditional abbreviation for the Latin Argentum) and atomic number 47.
Silver is found in native form, combined with sulfur, arsenic, antimony, or chlorine and in various ores such as argentite (Ag) and horn silver (AgCl).
Silver and compounds containing silver can be absorbed into the circulatory system and become deposited in various body tissues leading to the condition called argyria which results in a permanent grayish pigmentation of the skin and mucous membranes.
silver (2596 words)
Liberation from manufacture and casting of alloys; during fabrication of silver metal, alloys, and bimetals for electrical uses; and during electroplating operations and fabrication of solders and brazing alloys; during manufacture and use of photographic chemicals and materials; during manufacture of mirrors, and during manufacture of silver powder pigments and paints.
Principal ores are argentite, cerargyrite or horn silver (mixture of halides), proustite and pyrargyrite.
Silver is one of the most physically and physiologically cumulative of the elements, leading to a disturbing, permanent cosmetic effect when body burden has accumulated Ag in excess of 1 g.
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