ME 2733 : ME 2733 Final Exam (Part 1)
Document Summary
Structure of an atom which represents the manner in which the electron states are occupied. Lattice is a three-dimensional array of points coinciding with atom positions (or sphere systems). Unit cells are when the structure is divided into small repeat entities. The unit cell is the basic structural unit or building block of the crystal structure that defines the crystal structure by virtue of its geometry and the atom positions within. Fcc- each corner atom is shared among eight unit cells, whereas a face-centered atom belongs to only two. Atoms located at all eight corners and a single atom at the cube center. Point defects are those associated with one or two atomic positions; these include vacancies (or vacant lattice sites) and self-interstitials (host atoms that occupy interstitial sites). Dislocations are one-dimensional crystalline defects of which there are two pure types: edge and screw.
