2 - EMA 4144 Physical Ceramics Background Bonds Energy...

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EMA 4144 Physical Ceramics Background, Bonds, Energy Bands, Models, Crystals and Chemistry
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Objectives for S3 • Review atomic bonding considerations as applied to ceramic materials. 2 Wolfgang Sigmund - EMA 4144 Physical Ceramics - August 27, 2009
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Orbitals (orbitals.com) 3
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Orbitals 4
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Types of Bonding Covalent (Diamond) rength Metallic Ionic (NaCl) (Cu) bond st r crease in Van der Waals Hydrogen (H O [between molecules] ) e) In c 5 ( 2 [] (Ne)
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Ionic Bonding Cl Na 3p 3s 3s Closed K and L shells Closed K and L shells - - Cl 3p Na + F A F A 3s Na + Cl 6 r r o
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Ionic Bonding B e z z E 2 2 1 6 /(ion-pair) r = Na + Cl - n r r 0 4  0 0.28 nm gy E ( r ), e V Separation, r 1.5 eV gy otential ene Cohesive ene - + -6 -6.3 P e z z E ond 1 1 2 2 1 7 r o = 0.28 nm n r bond 4 0 0
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Lattice Energy Calculations NaCl . 6 8 12 6 1 2 2 1 e z z m 8 ... 4 3 2 1 1 4 0 0 n r E sum 
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Lattice Energy Calculations NaCl e z z E um 1 1 2 2 1  n r sum 4 0 0 or 1 mol of NaCl For 1 mol of NaCl e z z N E um 1 1 2 2 1 0 n r sum 4 0 0 9 Born-Lande Equation
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Covalent Bonding Covalent (Diamond) etallic nic strength from Petrucci et al. Metallic Ionic (NaCl) (Cu) se in bond ydrogen Increa s Reproduced figures from: Barsoum, Fundamentals of Ceramics; Van der Waals Hydrogen (H 2 O [between molecules] ) (Ne) 10 Kasap, Principles of Electronic Materials and Devices; and Petrucci et al., General Chemistry
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Interatomic Bonding Electron shell H-atom H-atom 1 s 1 s H-H Molecule 1 2 Covalent bond 1 2 11 H-H Molecule 1 2
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2 - EMA 4144 Physical Ceramics Background Bonds Energy...

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