crystal defect

noun Crystallography.
defect ( def 3 ).
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Encyclopedia Britannica
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crystal defect

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Solubility measurements and crystal defect maps were made with this equipment for a number of new materials.
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