222-227 Ionic crystals - • Perovskite Ex complex oxide...

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1 Chapter 3 - Predominant bonding in Ceramics Adapted from Fig. 2.7, Callister 7e. (Fig. 2.7 is adapted from Linus Pauling, The Nature of the Chemical Bond , 3rd edition, Copyright 1939 and 1940, 3rd edition. Copyright 1960 by Cornell University. Examples: Ionic Bonding Give up electrons Acquire electrons NaCl MgO CaF 2 CsCl
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2 Chapter 3 - AX Crystal Structures 939 . 0 181 . 0 170 . 0 Cl Cs = = - + r r Adapted from Fig. 12.3, Callister 7e. Cesium Chloride structure: cubic sites preferred So each Cs + has 8 neighboring Cl -
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3 Chapter 3 - Rock Salt Structure r Na = 0.102 nm r Cl = 0.181 nm
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4 Chapter 3 - MgO and FeO O 2- r O = 0.140 nm Mg 2+ r Mg = 0.072 nm So each oxygen has 6 neighboring Mg 2+
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5 Chapter 3 - AX Crystal Structures Zinc Blende structure Adapted from Fig. 12.4, Callister 7e. Ex: ZnO, ZnS, SiC
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6 Chapter 3 - ABX 3 Crystal Structures
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Unformatted text preview: • Perovskite Ex: complex oxide BaTiO 3 7 Chapter 3 -Carbon Forms- Diamond – Diamond Cubic • Extremely Hard • Brittle • The Best Insulator Si, Ge have a similar structure Adapted from Fig. 12.15, Callister 7e. 8 Chapter 3 -Carbon Forms - Graphite • layer structure – aromatic layers – weak van der Waal’s forces between layers – planes slide easily, good lubricant Adapted from Fig. 12.17, Callister 7e. 9 Chapter 3 -Carbon Forms – Fullerenes and Nanotubes • Fullerenes or carbon nanotubes – wrap the graphite sheet by curving into ball or tube – Buckminister fullerenes • Like a soccer ball C 60- also C 70 + others Adapted from Figs. 12.18 & 12.19, Callister 7e....
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222-227 Ionic crystals - • Perovskite Ex complex oxide...

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