104A Sp09 lecture 13

104A Sp09 lecture 13 - Do the radius ratio rules work?...

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Packing of Stars 13 states (1777) 20 states (1818) 48 states (1912) 50 states (1960) 31 states (1851) (+ Calif)
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Packing of Spheres
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Packing of Spheres
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hcp ccp
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Body-Centered Cubic (BCC) Structure e.g., Li, Na, K, Ba, V, Nb, Ta, Cr, Mo, W
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Lattice Holes Tetrahedral (T d ) Cubic Octahedral (O h )
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tetrahedral holes: octahedral holes:
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Ionic (and other) structures may be derived from the occupation of interstitial sites in close-packed arrangements.
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Unformatted text preview: Do the radius ratio rules work? Plots of Coulombic Madelung Energy vs. Radius Ratio Structure Maps Plots of r A vs. r B with structure type indicated Patterns of octahedral sites between pairs of cp layers for MX 2 compounds: rutile -PbO 2 Layered structures: van der Waals contacts Layers of the type found in BiI 3 , YCl 3 :...
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104A Sp09 lecture 13 - Do the radius ratio rules work?...

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