Chem_215_Lect_36_Color - 1 2 Ionic Solids (Salts) Stable,...

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3 Ionic Solids (Salts) • Stable, high melting point substances. • Held together by ionic forces • Most binary ionic solids involve closest packing of anions; cations occupy holes between anions. Need to examine details of holes to understand Structure…. .
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4 Ionic Solids - Large anions occupy closest packed structure. - Small cations occupy holes between anions. - Trigonal hole in plane of 3 atoms - Too small to accommodate cations. -Tetrahedral hole lies below atom sitting in dimple above 3 atoms. -Octahedral hole lies between 2 sets of 3 atoms in adjacent planes.
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5 -Octahedral hole lies between 2 sets of 3 atoms in adjacent planes. Octahedral Holes r = 0.414R
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6 -Tetrahedral hole lies below atom sitting in dimple above 3 atoms. Tetrahedral Holes r = 0.225R
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Large Cations If cations are very large, they cannot fit into octahedral holes. In this case, the anions form a simple cubic lattice (not closest packed), and cations sit in cubic holes. r = 0.732 R
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This note was uploaded on 03/05/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell University (Engineering School).

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Chem_215_Lect_36_Color - 1 2 Ionic Solids (Salts) Stable,...

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