Chemistry Lecture Notes 1 6 2015 Chapter 13 Crystal Lattices and Unit Cells Solids can t change relative positions so they have regular repeating patterns Properties of Solids 1 Locked into a crystal lattice 2 Particles are close together 3 Exhibits strong IMFs 4 Highly ordered rigid incompressible Unit cell smallest repeating internal unit with same symmetry There are 7 basic crystal systems but we will only deal with cubic form For a cubic lattice 1 8 atom on a corner 8 corners 1 atom total atom on a face 6 faces 3 atoms total atom on a side 12 sides 3 atoms total The Volume of a cube is always cell edge 3 the cell edge to the 3rd power Simple Primitive Model 1 8 8 1 atom Radius a 2 R Body Centered One atom in center 8 along edges 8 1 8 1 2 atoms Radius a 3 4 Face Centered 1 atom on each face so atom per face and there arefaces and 8 atoms along the 8 edges 8 1 8 1 2 6 4 atoms Radius a 2 4
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