point defect


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Related to point defect: Frenkel defect, line defect

point defect

n.
A departure from symmetry in the alignment of atoms in a crystal that affects only one or two lattice sites.

point defect

n
(Chemistry) an imperfection in a crystal, characterized by one unoccupied lattice position or one interstitial atom, molecule, or ion
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The focus returns to the original physical metallurgy, and the material has been rearranged so that separate chapter deal with solidification, point defect behavior, interfaces and grain boundaries, precipitation hardening, and other matters.
I aim to transfer very recent developments for low-dose imaging from structural biology to the case of point defect configurations in a crystalline material, to allow the identification of atomic configurations that are currently not accessible as they do not withstand the electron dose that would be needed for their identification.
The four time indicators listed before are calculated in this case on a vibratory signal measured on a bearing with a point defect on the inner ring.
Although not a point defect, scratch and abrasion are more likely to occur as a coating weathers.
For the most severe defects, the models can predict internal features such as total depth, midway point defect width and length, and penetration angle, with a low measurement error.
The detection of the role of freely migrating point defects and the point defect reaction by the effect of collision impact should also be mentioned.
While avoiding overlap with other papers in this volume, this article summarizes results from: 1) early work on crystallization as a method of purification, in contributions to sugar chemistry, and in solution growth of large crystals; 2) the NBS/ARPA Program of research on crystal growth and characterization; 3) the NBS Free-Radical Research Program; 4) the XRCD method as a direct path to relative atomic mass data and the fundamental physical constants; 5) the dynamical theory of x-ray diffraction; and 6) symmetry considerations such as are involved in the influence on crystals of mechanical stress or fields, and of point defect motion.
A Review of some Theoretical Models for Point Defect Calculations
The guide also covers basic concepts in the chemistry and physics of defects, links principles to real-world applications, covers cutting-edge applications, and includes chapters on point defect chemistry, linear and planar defects, diffusion in solids, magnetic and optical defects, and more.
Essays are grouped into categories covering point defect relaxation and diffusion, dislocation dynamics, grain boundaries, nanocrystaline structures and thin films, phase transformations, amorphous materials, and high and low dampening techniques.
Researchers Address a Long-Standing Open Problem in Solid State Physics of Point Defect - Dopant Pair Lifetimes
These defects, such as micro-cracks, slip lines and point defects, may cause a wafer breakage or device failure during rapid thermal processes such as fast laser annealing, or during wafer handling.