MS115a Lect 04a 10 03 2011

MS115a Lect 04a 10 03 2011 - Review: Common Metal...

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Review: Common Metal Structures hcp ccp (fcc) bcc ABABAB ABCABC not close-packed Features Filled outer shells   spherical atom cores, isotropic bonding Maximize number of bonds   high coordination number High density 
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Which is more stable? + + Isotropic bonding; alternate anions and cations + Just barely stable
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http://www.chem.ox.ac.uk/icl/heyes/structure_of_solids/Lecture3/Lec3.html#anchor4 central atom drawn smaller than available space for clarity
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Radius Ratio Rules CN (cation) Geometry min r c /R A 2 none (linear) 3 0.155 (trigonal planar) 4 0.225 (tetrahedral) Consider: CN = 6, 8 12
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Octahedral Coordination: CN = 6 2R A r c + R A
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This note was uploaded on 01/03/2012 for the course MS 115a taught by Professor List during the Fall '09 term at Caltech.

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MS115a Lect 04a 10 03 2011 - Review: Common Metal...

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