10-10 - Chapter 8: Solid Materials Structure of solids...

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Chapter 8: Solid Materials crystalline  amorphous  Structure of solids  Crystal lattice Crystal lattice: pattern of the ordered array Section 8.0 X  O  X  O  X  O  X  O O  X  O  X  O  X  O  X X  O  X  O  X  O  X  O O  X  O  X  O  X  O  X X  O  O  X  X  O  X  O O  X  X  X  O  X  O  X X  O  X  O  O  O  X  O X  X  X  O  X  X  X  O Local order Long range order Unit cell Unit cell: simplest portion that shows the pattern
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Structure of solids  Unit cell Unit cell: simplest portion that shows the pattern (repeat unit) Cubic unit cells sc  simple cubic  lattice sites corners bcc  Body-centered  cubic  lattice sites fcc Face-centered cubic  lattice sites Section 8.1
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simple cubic (primitive)  lattice sites: corners Atoms/cell = 8 corner atoms x 1/8 ownership Atoms/cell = 1 Atom Packing Efficiency = 52 % Very light material. Not dense. Example: Polonium Coordination Number = 6 Section 8.1-8.5
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Body-centered cubic  lattice sites Atoms/cell = 8 corner atoms x 1/8 ownership + 1 central atom at full ownership Atoms/cell = 2 Atoms Packing Efficiency = 68 % More dense than SCC Example: iron Coordination Number = 8 Section 8.1-8.5
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Face-centered cubic  lattice sites: Atoms/cell = 8 corner atoms x 1/8 ownership + 6 face atoms x 1/2 ownership Atoms/cell = 4 Atoms Packing Efficiency = 74 % Most Dense cubic cell Example: iron in stainless steel Coordination Number = 12 Section 8.1-8.5
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Unit Cell Ownership of Atoms  1 center atom at full ownership = 1 atom Section 8.3 A cube has 1 center It takes 1 cube to “own” a center atom
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10-10 - Chapter 8: Solid Materials Structure of solids...

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