104A Sp09 lecture 11

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

This preview shows pages 1–10. Sign up to view the full content.

The Solid State Reading: Miessler and Tarr, Chapter 7

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

This note was uploaded on 09/03/2009 for the course CHEM ???? taught by Professor Tiley during the Spring '09 term at Berkeley.

Page1 / 10

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

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online