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4 Cards in this Set

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0-dimensional defects
We have "point defects" (on occasion abbreviated PD), or, to use a better but unpopular name, "atomic size defects" .

Most prominent are vacancies (V) and interstitials (i). If we mean self-interstitials (and you should be careful with using the name interstitials indiscriminately), these two point defects (and if you like, small agglomerates of these defects) are the only possible intrinsic point defects in element crystals.

If we invoke extrinsic atoms, i.e. impurity atoms on lattice sites or interstitial sites, we have a second class of point defects subdivided into interstitial or substitutional impurity atoms or extrinsic point defects.

In slightly more complicated crystals we also may have mixed-up atoms (e.g. a Ga atom on an As site in a GaAs crystal) or antisite defects
1-dimensional Defects
This includes all kinds of dislocations; for example:
Perfect dislocations, partial dislocations (always in connection with a stacking fault), dislocation loops, grain boundary and phase boundary dislocations, and even
Dislocations in quasicrystals.
2-dimensional Defects
Here we have stacking faults (SF) and grain boundaries in crystals of one material or phase, and
Phase boundaries and a few special defects as e.g. boundaries between ordered domains.
3-dimensional Defects
This includes: Precipitates, usually involving impurity atoms.
Voids (little holes, i.e. agglomerates of vacancies in three-dimensional form) which may or may not be filled with a gas, and
Special defects, e.g. stacking fault tetrahedra and tight clusters of dislocations.