L10FundCryst145s10

L10FundCryst145s10 - Lecture 10: Fundamentals of...

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1 Lecture 10, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University 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
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2 Lecture 10, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Exam #1: Comments Papers will be returned at next recitation Key posted at MediaVision website Grades will be posted on Blackboard Partial credit: Correct equations Correct input Correct reasoning Deductions: Incorrect answers/calculations Not showing work >1 too many or too few signiFcant digits Incorrect units Cumulative questions: if a previous incorrect answer is used in an otherwise correct way to answer later questions, no additional points were deducted In case of errors in scoring: please return your exam to Professor De Guire or your recitation instructor, indicating what you think was misscored. The grading of entire exam will be re-checked and will be rectiFed if warranted.
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3 Lecture 10, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Bonding Determines Symmetry [OGC §21.1] Covalent crystals Orientation of orbitals imposes symmetry on bonds ( e.g. hybridization) Bonds are highly directional
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This note was uploaded on 01/30/2011 for the course EMSE 103 taught by Professor Ggh during the Spring '10 term at Case Western.

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L10FundCryst145s10 - Lecture 10: Fundamentals of...

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