What are the mechanisms by which antisite defects are formed in crystals?
If there are any papers on the mechanism of antisite defect formation, I would appreciate it. The formation of antisite defects on transitional metal mono-carbides is something I am interested in understanding. I would appreciate it if you could provide me with some literature or explanation.
Thank you.
Dear Dr Indiras Khatri,
You may want to look over the following data:
Semiconductor Compounds and Alloys, Electronic States of
The most common defects in compound semiconductors are vacancies and antisite defects (i.e., A ions on B sites). The energies of formation and the electronic states associated with these defects depend on the position of the Fermi energy (the doping level) and strain. These energies can be estimated very accurately using pseudopotentials. The antisite defect energies are at least ten times smaller than the vacancy energies, and are comparable to thermal energies at growth temperatures. Thus antisite defects are the most important defects in most compound semiconductors. An example is strain at quantum well interfaces. Macroscopically, one would expect that such interfaces would be most stable when strain-free. In practice, a small amount of interfacial misfit is found to be optimal. This misfit may suppress diffusion of antisite defects; it is larger, for example, in InP-based cases (large antisite size difference) than in GaAs-based cases (small antisite size difference). Empirically, in manufacturing devices, the presence of these defects is reduced by the use of proprietary (confidential) methods. In other words, here science and technology are separated by important business considerations.
https://www.sciencedirect.com/topics/physics-and-astronomy/antisite-defects
_____
_____
Antisite defects occur in an ordered alloy or compound when atoms of different type exchange positions. For example, some alloys have a regular structure in which every other atom is a different species; for illustration assume that type A atoms sit on the corners of a cubic lattice, and type B atoms sit in the center of the cubes. If one cube has an A atom at its center, the atom is on a site usually occupied by a B atom, and is thus an antisite defect. This is neither a vacancy nor an interstitial, nor an impurity.
https://en.wikipedia.org/wiki/Crystallographic_defect
_____
_____
- Badges
- Science topic
- Similar topics
- Biological Science
- Molecular Cell Biology
- Culture Cells
- Cell Line