MS115a Lect 02-3 09 30 2011

MS115a Lect 02-3 09 30 2011 - Types of Primary Chemical...

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Metallic Electropositive: give up electrons Ionic Electronegative/Electropositive Colavent Electronegative: want electrons Shared electrons along bond direction Types of Primary Chemical Bonds Isotropic, filled outer shells + - + - + - + - + + + + + + + + + + e- e- e- Close-packed structures
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mirror plane (glide plane) a 1 a 2 high symmetry locations are good candidates for lattice points unit cell not a unit cell 6-fold rotation axis 2-fold rotation axes 3-fold rotation axes Definitions Lattice point Unit cell Lattice parameters Atoms per unit cell Symmetry operations Fractional coordinates Coordination number
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A B
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A C
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A B B A B A B A…. A
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A C C A C A C A…. A
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A B A B C A B C …. C
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Metallic materials have isotropic bonding In 2-D close-packed spheres generate a hexagonal array In 3-D, the close-packed layers can be stacked in all sorts of sequences Most common are A B A B A B ..
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MS115a Lect 02-3 09 30 2011 - Types of Primary Chemical...

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