104A Sp09 lecture 11

104A Sp09 lecture 11 - single lattice point 2D LATTICES e.g...

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The Solid State Reading: Miessler and Tarr, Chapter 7
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Some Basic Definitions LATTICE : An infinite array of points in space, in which each point has identical surroundings to all others . CRYSTAL STRUCTURE : The periodic arrangement of atoms in the crystal. It can be described by associating with each lattice point a group of atoms called the MOTIF ( BASIS ) ŋ Don't mix up atoms with lattice points ŋ Lattice points are infinitesimal points in space ŋ Atoms are physical objects ŋ Lattice Points do not necessarily lie at the center of atoms UNIT CELL : The smallest component of the crystal, which when stacked together with pure translational repetition reproduces the whole crystal Primitive ( P ) unit cells contain only a
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Unformatted text preview: single lattice point 2D LATTICES e.g. the fused hexagonal pattern of a single layer of GRAPHITE Counting Lattice Points/Atoms in 2D Lattices ŋ Unit cell is Primitive (1 lattice point) but contains TWO atoms in the Motif ŋ Atoms at the corner of the 2D unit cell contribute only 1/4 to unit cell count ŋ Atoms at the edge of the 2D unit cell contribute only 1/2 to unit cell count ŋ Atoms within the 2D unit cell contribute 1 ( i.e. uniquely) to that unit cell e.g. Graphite = a staggered arrangement of stacked hexagonal layers Perspective: Clinographic views of solids Projection onto a Plane: Plan views of solids 3D LATTICES...
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This note was uploaded on 09/03/2009 for the course CHEM ???? taught by Professor Tiley during the Spring '09 term at Berkeley.

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104A Sp09 lecture 11 - single lattice point 2D LATTICES e.g...

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