e4511lecture-3 - J.W. Morris, Jr. University of California,...

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Unformatted text preview: J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2011 The field can be summarized in two sentences: Properties <= composition + microstructure Microstructure <= composition + processing Composition = kind and fraction of atoms present Microstructure = How those atoms are arranged Microstructure is not only essential to understanding properties It is often much more important than composition The Essence of Materials Science J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2011 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 J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2011 Bonding Electrons between nuclei see both => attraction Closed inner shells overlap => repulsion r J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2011 Bonding Bonding is primarily by valence electrons Bonding is electrostatic The chemists model Chemical bonds are localized between atoms The physicists model Electrons wander through the solid Electron states are gathered into bands J.W. Morris, Jr. University of California, Berkeley Engineering 45 Spring, 2011 The Chemists 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 J.W. Morris, Jr....
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This note was uploaded on 04/05/2011 for the course ENGIN 45 taught by Professor Devine during the Spring '07 term at University of California, Berkeley.

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e4511lecture-3 - J.W. Morris, Jr. University of California,...

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