MAE381 3 2010

MAE381 3 2010 - Chapter 3: Crystalline Structure Last...

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Chapter 3: Crystalline Structure Last section of Chapter 3 (on diffraction) will not be covered. Miller-Bravais indices will not be covered.
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No order Short-range order Short-range order Long-range order
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Amorphous structure of glassy silica (SiO 2 ). No long-range order is present, but there is short-range order in that every silicon atom is surrounded tetrahedrally by four oxygen atoms.
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Semi-crystalline polymeric material
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Semi-crystalline zinc sulfide with nanocrystals
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A crystalline material showing facets in fracturing
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A polycrystalline material
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The grain structure of a polycrystalline material
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Crystal Structures -- Fundamental Concepts Crystalline material: atoms (or ions) are situated in periodic array over large distances. Atomic hard sphere model used to describe crystalline structures.
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Lattice (space lattice) – regular periodic arrangement of points in space such that all points have identical environment. These points are called lattice points.
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A basis is a group of atoms that is associated with every lattice point. Example of a basis: There can be any number of atoms in the basis. The atoms in the basis can be arranged in any manner. 2 atoms of different radii
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Lattice + basis = crystal structure
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Example of a crystal structure obtained by associating the above lattice with the above basis:
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Unit cell Repetitive unit of a crystal structure
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Unit Cells : small group of atoms that form a repetitive pattern.
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For the rectangular lattice, a possible unit cell is Lattice point (not atom)
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By propagating or repeating the unit cell, the lattice results.
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Another possible unit cell for the same lattice is
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This note was uploaded on 12/19/2010 for the course MAE 381 taught by Professor Chung during the Spring '08 term at SUNY Buffalo.

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MAE381 3 2010 - Chapter 3: Crystalline Structure Last...

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