NSCI 1322 Lecture Notes - Lecture 70: Cubic Crystal System, Liquid Crystal, Metal

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The cubic crystal system has three possible cubic unit cells: simple (or primitive) cubic, body-centered cubic, and face-centered cubic. A simple cubic unit cell is a cubic unit cell in which lattice points are situated only at the corners. A body-centered cubic unit cell is a cubic unit cell in which there is a lattice point at the center of the cubic cell in addition to those at the corners. A face-centered cubic unit cell is a cubic unit cell in which there are lattice points at the centers of each face of the unit cell in addition to those at the corners. The simplest crystal structures are those in which there is only a single atom at each lattice point. Copper metal has a face-centered cubic unit cell with one copper atom at each lattice point. Only that portion of each atom belonging to a unit cell is shown.

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