e4510lecture-3 - Bonding Solids are made of atoms or...

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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2010 Bonding • Solids are made of atoms or molecules • These stick together – “ bonding • Understanding bonding is fundamental – Microstructure – Properties • Some important properties are determined by the nature of bonding alone
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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2010 Bonding • Bonding is primarily by valence electrons • Bonding is electrostatic The “chemist’s” model Chemical bonds are localized between atoms • The “physicist’s” model – Electrons wander through the solid – Electron states are gathered into “bands”
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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2010 The Chemist’s model: Chemical Bonding Types of bonding – Covalent => shared electron, saturated – Metallic => shared electron, unsaturated – Ionic => electrons exchanged to charge ions – Dipole (Van der Waals ) => transient or permanent dipoles - + Ionic bond + - + - Dipole bond Shared Electron Bond covalent metallic
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J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2010 Bonding • Bonding is primarily by valence electrons • Bonding is electrostatic • The “chemist’s” model – Chemical bonds are localized between atoms The “physicist’s” model Electrons wander through the solid Electron states are gathered into “bands”
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J.W. Morris, Jr. University of California, Berkeley
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This note was uploaded on 02/09/2010 for the course ENGIN 45 taught by Professor Devine during the Spring '07 term at University of California, Berkeley.

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e4510lecture-3 - Bonding Solids are made of atoms or...

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