Crystals #2

Crystals #2 - Crystals Part 2 References: Gray: Chapter 6...

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Crystals Part 2 References: Gray: Chapter 6 OGN: Chapter 19 and (24.1)
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Stoichiometry of Zinc Blende 4 Lattice Atoms: 4 Tetrahedral Holes 1:1 Stoichiometry (GaAs, InP, CdS, ZnS) Corner Atoms (8 * 1/8 = 1) Face Atoms (6 * 1/2 = 3) T d Holes (4 * 1 = 4)
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Stoichiometry of Anti-Fluorite 4 Lattice Anions: 8 Tetrahedral Cations 1:2 Stoichiometry (Li 2 O, Na 2 O, Li 2 S) Corner Atoms (8 * 1/8 = 1) Face Atoms (6 * 1/2 = 3) T d Holes (8 * 1 = 8)
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Stoichiometry of Fluorite 4 Lattice Cations: 8 Tetrahedral Anions 1:2 Stoichiometry (CaF 2 , SrCl 2 , HgF 2 ) Corner Atoms (8 * 1/8 = 1) Face Atoms (6 * 1/2 = 3) T d Holes (8 * 1 = 8)
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Stoichiometry of Li 3 B 4 Lattice Anions : 8 Tetrahedral Cations + 4 Octahedral Cations 1 : 3 Stoichiometry (Li 3 B) Corner Atoms (8 * 1/8 = 1) Face Atoms (6 * 1/2 = 3) T d Holes (8 * 1 = 8) O h Holes (12 /4 = 3) O h Hole (1)
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Cs Cl Na Cl Zn S (Biggest Cation/Anion) (Smallest Cation/Anion) (Intermediate Cation/Anion)
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Geometry of Cubic Lattices
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Geometry of Cubic Lattices r l r l
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Geometry of Cubic Lattices 2 r l + r h ( ( ) ) 2 2 r l 2r 2r l
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MgSe (0.33) MgS (0.35) CaTe (0.45) MgO (0.46) NaCl, all MX (M=Li, K, Na)
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This note was uploaded on 08/31/2008 for the course CH 1a taught by Professor Lewis during the Fall '08 term at Caltech.

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Crystals #2 - Crystals Part 2 References: Gray: Chapter 6...

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