MSE2001H_3_1 - 1 Chapter 3 Crystal Structures Introduction...

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1 • Introduction • Bravais Lattice • Crystals with One Atom per Lattice Point • Miller Indices • Densities and Packing Factors of Crystalline Structures • Interstitial Positions and Sizes • Crystals with Multiple Atoms per Lattice Site • Liquid Crystals • Single Crystals and Polycrystalline Materials • Polymorphism • X-Ray Diffraction Chapter 3 Crystal Structures
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2 •A crystal is a solid (or liquid) in which the constituent atoms, molecules, or ions are packed to have a long range order as well as a short range order . In crystal, its unit structure is repeated in all three (or two) spatial dimensions. Many materials (metals, ceramics, and polymers) crystallize in a regular array with basic building blocks being at repeated regular intervals. The structure is determined by the bond character and energy minimization. Properties are dependent upon the type of bond and the structure. Chapter 3 Crystal Structures
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3 Bravais Lattice and Unit Cells Basis : group of things located on the lattice Lattice : 1. an infinitely extended 3-dimensional point array 2. each point is surrounded by an identical group of neighboring points. Lattice + Basis = crystal structure
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4 Unit Cells Unit cell : the smallest region that completely describes the pattern Unit cell a b φ Cell parameters: a, b, and φ
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5 Bravais Lattice and Unit Cells 7 crystal systems
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6 Bravais Lattice and Unit Cells 7 crystal systems (continued)
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7 14 Bravais Lattices P: primitive I: body centered F: face centered C: base centered
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This note was uploaded on 06/29/2009 for the course MSE 2001 taught by Professor Tannebaum during the Spring '08 term at Georgia Institute of Technology.

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MSE2001H_3_1 - 1 Chapter 3 Crystal Structures Introduction...

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