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Frenkel defect



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A Frenkel defect, also called a Frenkel pair or Frenkel disorder, is a compound crystallographic defect in which an interstitial lies near a vacancy. A Frenkel defect forms when an atom or ion leaves its place in the lattice (leaving a vacancy), and lodges nearby in the crystal (becoming an interstitial). The phenomenon is named after the Russian physicist Yakov Frenkel.

For example, consider a lattice formed by X and M ions. Suppose an M ion leaves the M sublattice, leaving the X sublattice unchanged. The number of interstitials formed will equal the number of vacancies formed.

This can be illustrated with the example of the sodium chloride crystal structure. The diagrams below are schematic two-dimensional representations.

   


See also
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Frenkel_defect". A list of authors is available in Wikipedia.
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