Physics of silver halides and their applications

Bose, D. N. ; Govindacharyulu, P. A. (1980) Physics of silver halides and their applications Bulletin of Materials Science, 2 (4). pp. 221-231. ISSN 0250-4707

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Silver halides are notable for exhibiting both ionic and electronic conductivity which is responsible for their widespread use in photography. Due to differences in ionicity and bonding, their properties vary from the highly ionic silver fluoride to the more covalent silver iodide. These fundamental properties such as defect formation energies, carrier mobilities and band-structures, particularly of silver iodide, have only recently been determined. One interesting finding is the presence of high surface fields, caused by differences between interstitial and vacancy formation energies, which results in separation of photo-generated electron hole pairs. This throws new light on the photographic process and on the suitability of silver bromide as a photographic material. α-AgI is also the first fast ion conductor to be discovered. Structural instability, low defect formation energy and optimum cation size are responsible for this phenomenon but existing models fail to explain all the experimental results. Recent microwave conductivity and neutron scattering experiments which provide fresh insight are discussed.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Silver Halides; Ionic Conductivity; Defect Energy; Carrier Mobility; Surface Field; Photography; Fast Ion Conduction
ID Code:5764
Deposited On:19 Oct 2010 11:05
Last Modified:16 May 2016 16:13

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