L10FundCryst145s09

L10FundCryst145s09 - Click to edit Master subtitle style...

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Unformatted text preview: Click to edit Master subtitle style Lecture 10, spring 2009 ENGR 145, Chemistry of Materials Case Western Lecture 10, spring 2009 ENGR 145, Chemistry of Materials Case Western Reading assignment : C&R 3.10-3.14; OGC 21.1-21.2 Learning objectives: Know and be able to distinguish crystal systems Understand the following concepts: unit cell centered lattices Be able to identify crystallographic directions and planes Note: http://www.doitpoms.ac.uk/tlplib/miller_indices/index.php contains a nice tutorial, which goes into more detail than this course Lecture 10: Fundamentals of Crystallography Lecture 10, spring 2009 ENGR 145, Chemistry of Materials Case Western Lecture 10, spring 2009 ENGR 145, Chemistry of Materials Case Western Bonding Determines Symmetry [OGC 21.1] Covalent crystals Orientation of orbitals imposes symmetry on bonds ( e.g. hybridization) Bonds are highly directional Ionic crystals Optimizing Coulombic interactions imposes symmetry, e.g. radius ratios Bonds are mostly non-directional Metallic crystals Maximizing CN while minimizing repulsion between atom cores imposes symmetry Bonds are mostly non-directional C&R Figs. 2.9 & 2.11 Lecture 10, spring 2009 ENGR 145, Chemistry of Materials Case Western Lecture 10, spring 2009 ENGR 145, Chemistry of Materials Case Western Lattice: periodic array of points in space translational symmetry Translation vectors between lattice points define a unit cell Motif (basis): atoms or molecules associated with each lattice point Lattices, Unit Cell, and Motifs [OGC 21.1] Lecture 10, spring 2009 ENGR 145, Chemistry of...
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L10FundCryst145s09 - Click to edit Master subtitle style...

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