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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In geometries that encourage a point defect or a disclination line (or such), instead of an isotropic defect core, there typically would form a small structure (such as a ring or torus) across which such an eigenvalue-exchange transition would occur [6, 10, 14, 17, 21, 26].
Analyzing these data, the nature of the 7.6 eV absorption band cannot be ascribed to a single point defect in [alpha]-quartz with ODC(I) defects.
The scientists turned to the nitrogen vacancy colour centre to tackle this issue; this is a point defect in diamonds used in quantum applications for the electron spin within it, when light or a magnetic field is applied.
The structure is made of a linear waveguide by creating point defect and a hexagonal ring at the center acts as a resonator, then the resonant wavelength is dropped to the output port.
According to Table 2, we plotted the formation energies of the single point defect in Figure 4.
Uberuaga, "The influence of grain boundaries on radiation-induced point defect production in materials: a review of atomistic studies," JOM, vol.
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.
Tetrahedron Perfect Point defect, vacancy Si crystal [VC.sub.1] clusters, [TVC.sub.5] Lattice constant 5.431 5.346 5.241 ([Angstrom]) Band gap (eV) 0.59 0.31 0.25 Hexagonal ring vacancy clusters, [HRVC.sub.10] Lattice constant 5.194 ([Angstrom]) Band gap (eV) 0.21 TABLE 2: List of high-symmetry k-point paths.
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.