Lecture note 2 (09-08-2011)

Lecture note 2 (09-08-2011) - MAE 581 Advanced Materials...

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MAE 581 Advanced Materials Science Lecture note 2 Crystal lattices and structures Having discussed the electronic states and bonding between atoms and so on, we can now focus on the arrangement of atoms to form solids. Except for a few exceptional metallic systems which can form metallic glasses, most metals and alloys usually have crystalline structures. Figure 1.6a shows a three-dimensional lattice in which triple intersections of three families of parallel equidistant lines mark the positions of atoms. In this simple case, three reference axes ( x , y , z ) are oriented at to each other and atoms are ‘shrunk’, for convenience. The orthogonal lattice of Figure 1.6a defines eight unit cells, each having a shared atom at every corner. It follows from our recognition of the inherent order of the lattice that we can express the geometrical characteristics of the whole crystal, containing millions of atoms, in terms of the size, shape and atomic arrangement of the unit cell, the ultimate repeat unit of structure. Figure 1.6
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This note was uploaded on 01/16/2012 for the course MAE 581 taught by Professor Fu during the Fall '11 term at SUNY Buffalo.

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Lecture note 2 (09-08-2011) - MAE 581 Advanced Materials...

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