Chp8 - Chapter 8 Solid Materials Unit Cells Band Theory...

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Chapter 8 – Solid Materials Unit Cells Band Theory Ionic Solids Covalent Solids Molecular Solids
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Classification of Solids Amorphous – “without form”, lack defined shape, melt over temperature range, IMF vary throughout sample ex) rubber, glass Crystalline – components are arranged in well defined manner, long range order, melt at specific T, form described by unit cell ex) amethyst, pyrite
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Unit Cell b a c γ α β Smallest repeating unit of crystalline solid Defined by 3 edge lengths (a,b,c) and by 3 angles ( α , β , γ ) Only 7 different types of unit cells Cubic unit cell (a=b=c) and ( α = β = γ )
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Types of Solids
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Metals Consist entirely of metal atoms Bonding a result of valence e - that are delocalized throughout the solid (+ in a “sea” -) Wide range of physical properties e - e - e - M + M + M + M + M + M + e - e - e - M + M + M + M + M + M + e - e - e - M + M + M + M + M + M + e - e - e - M + M + M + M + M + M + e - e - e - e - e - e -
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This note was uploaded on 01/24/2010 for the course CH Ch101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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Chp8 - Chapter 8 Solid Materials Unit Cells Band Theory...

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