FIGURE15.1 Two-dimensional illustration of crystalline order. (a) Example of a
crystal lattice with perfect order. (b) Example of a defect in the crystal leading to a
dislocation in the lattice. (c) A polycrystalline material. (From L. S. Dent Glasser.
Crystallography and Its Applications. Van Nostrand Reinhold, Wokingham (Berks),
1977.)
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