- crystal defect
Crystall.defect (def. 3).
* * *imperfection in the regular geometrical arrangement of the atoms in a crystalline solid. These imperfections result from deformation of the solid, rapid cooling from high temperature, or high-energy radiation (X-rays or neutrons) striking the solid. Located at single points, along lines, or on whole surfaces in the solid, these defects influence its mechanical, electrical, and optical behaviour.Point defects include the Frenkel type, the Schottky type, and the impurity type. The Frenkel defect involves a single ion, which is displaced from its normal lattice point and shifts to a nearby interstice, or space, between atoms in the lattice. In the Schottky defect, two ions of opposite sign leave the lattice. Impurity defects are foreign atoms that replace some of the atoms making up the solid or that squeeze into the interstices; they are important in the electrical behaviour of semiconductors, which are materials used in computer chips and other electronic devices.Line defects, or dislocations, are lines along which whole rows of atoms in a solid are arranged anomalously. The resulting irregularity in spacing is most severe along a line called the line of dislocation. Line defects can weaken or strengthen solids.Surface defects may arise at the boundary between two grains, or small crystals, within a larger crystal. The rows of atoms in two different grains may run in slightly different directions, leading to a mismatch across the grain boundary. The actual external surface of a crystal is also a surface defect because the atoms on the surface adjust their positions to accommodate for the absence of neighbouring atoms outside the surface.
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crystal defect — kristalo defektas statusas T sritis fizika atitikmenys: angl. crystal defect; crystal imperfection vok. Kristallbaufehler, m; Kristalldefekt, m rus. дефект кристалла, m pranc. défaut du cristal, m; imperfection du cristal, f … Fizikos terminų žodynas
crystal defect — kristalo defektas statusas T sritis chemija apibrėžtis Tvarkiosios kristalo sandaros pažeidimas. atitikmenys: angl. crystal defect rus. дефект кристалла … Chemijos terminų aiškinamasis žodynas
crystal defect — Crystall. defect (def. 3) … Useful english dictionary
crystal — crystallike, adj. /kris tl/, n., adj., v., crystaled, crystaling or (esp. Brit.) crystalled, crystalling. n. 1. a clear, transparent mineral or glass resembling ice. 2. the transparent form of crystallized quartz. 3. Chem., Mineral. a solid body… … Universalium
Crystal — /kris tl/, n. 1. a city in SE Minnesota, near Minneapolis. 25,543. 2. a female given name. * * * I Any solid material whose atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry. Each of a crystal s… … Universalium
defect — defectible, adj. defectibility, n. defectless, adj. n. /dee fekt, di fekt /; v. /di fekt /, n. 1. a shortcoming, fault, or imperfection: a defect in an argument; a defect in a machine. 2. lack or want, esp. of something essential to perfection or … Universalium
crystal imperfection — kristalo defektas statusas T sritis fizika atitikmenys: angl. crystal defect; crystal imperfection vok. Kristallbaufehler, m; Kristalldefekt, m rus. дефект кристалла, m pranc. défaut du cristal, m; imperfection du cristal, f … Fizikos terminų žodynas
Defect — Defect, defects, or defected may refer to: Geometry and physical sciences Defect (geometry), a characteristic of a polyhedron Topological defect Isoperimetric defect Crystallographic defect, a structural imperfection in a crystal Biology and… … Wikipedia
Crystal chemistry — is the study of the principles of chemistry behind crystals and their use in describing structure property relations in solids. The principles that govern the assembly of crystal and glass structures are described, models of many of the… … Wikipedia
Crystal arthropathy — Classification and external resources ICD 10 M10 M11 ICD 9 … Wikipedia