A crystal with a volume of 1 cm3 will contain about 1023 atoms. Lattice theory requires in principle that all of these atoms occupy a regular lattice. The array of atoms must conform to one of the 230 space groups. The equivalent points of a position of a space group must be fully occupied by atoms of the same type. This theoretical model is only achieved conceptually, by an ideal crystal.
KeywordsInclination Angle Burger Vector Twin Boundary Screw Dislocation Edge Dislocation
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