Sphere Packing in Crystalline Solids
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12 Terms
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Cubic closest packing (FCC)
Coordination #12
4 atoms
3 different layers
Most efficient
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Body Centered Packing (BCC)
Coordination #8 2 atoms 2 layers
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Simple Cubic Packing (SC)
Coordination #6
1 atom
1 layer
Least Efficient
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Bragg’s Law
d = n𝜆/2sinθ
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Ionic Compounds
(ex. NaCl) Brittle, Higher melting point, Conducting and nonconducting
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Covalent
(ex. H2O(s))do not conduct electricity
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Covalent Network
(ex. Diamonds) Very high melting point, very hard
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Metallic
(ex. Fe(s)) conduct electricity, malleable and ductile
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Amorphus
atoms are clumped together…no geometric arrangement (ex. Plastic and rubber)
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SC Length
l = 2 × r
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FCC Length
l = sqrt(8) * r
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BCC Length
l = 4r/sqrt(3)
Note 
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