Crystallographic defects

disruption of the periodicity of a crystal lattice

thumb|upright=1.5|Dislocations of edge (left) and screw (right) type. In materials science, a dislocation is a linear crystallographic defect or irregularity within a crystal structure that contains an abrupt change in the arrangement of atoms. The movement of dislocations allows atoms to slide over each other at low stress levels and is known as glide or slip. The crystalline order is restored on either side of a glide dislocation but the atoms on one side have moved by one position. The crystalline order is not fully restored with a partial dislocation. A dislocation defines the boundary bet

concept in materials science: the interface between two grains, or crystallites, in a polycrystalline material

type of point defect in a crystal, in which an atom is missing from one of the lattice sites

point defect in a crystal

process in which small crystals preferentially dissolve and re-precipitate onto larger crystals over time

dislocation of atoms in a solid caused by neutron radiation

thumb|220px|F-center in an NaCl crystal An F-center or color center or Farbe center (from the original German Farbzentrum, where Farbe means color and zentrum means center) is a type of crystallographic defect in which an anionic vacancy in a crystal lattice is occupied by one or more unpaired electrons. Electrons in such a vacancy in a crystal lattice tend to absorb light in the visible spectrum such that a material that is usually transparent becomes colored. The greater the number of F centers, the more intense the color of the compound. F centers are a type of color center.

a type of point defect in a crystal lattice

point defect in diamonds

net transport of atoms through a solid

conventions used to describe electric charge and lattice position for point defect species in crystals

thumb|Decahedral PtFe1.2 nanoparticle.In crystallography, a disclination is a line defect in which there is compensation of an angular gap. They were first discussed by Vito Volterra in 1907, who provided an analysis of the elastic strains of a wedge disclination. By analogy to dislocations in crystals, the term, disinclination, was first used by Charles Frank and since then has been modified to its current usage, disclination. As pointed out by John D. Eshelby, there is an intricate connection between disclinations and dislocations, with dislocation motion moving the position of a disclinatio

concept in materials science, which explains how dislocations are pinned in some metals by boron, carbon, or nitrogen interstitials

disordering of crystallographic planes