L12CmpdCrStXRD145s10

L12CmpdCrStXRD145s10 - Lecture 12, spring 2010 ENGR 145,...

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Unformatted text preview: Lecture 12, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Reading assignment : C&R 3.6-3.7; 3.17-3.18; 3.20; OGC pp. 868-871; 21.3 Learning objectives: Understand how radius ratios influence coordination number in ionic compounds Recognize several cubic compound crystal structures Understand the difference between single crystals and polycrystalline materials Understand how x-ray diffraction can reveal the structure of crystalline materials Lecture 12: Compound Crystal Structures; Polycrystals; X-ray Diffraction 1 Lecture 12, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Ionic Compound Formation Anions negatively charged Larger than the unionized atom Cations positively charged Smaller than the unionized atom Attraction Anion cation Repulsion Anion anion Cation cation - + - - + + Lecture 12, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Ionic Compound Formation Anions negatively charged Larger than the unionized atom Cations positively charged Smaller than the unionized atom Attraction Anion cation Repulsion Anion anion Cation cation - + - - + + 2 3 Lecture 12, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Ionic Compound Formation [C&R 3.6] Stable ionic crystals maximize cation-anion contact minimize anion-anion & cation-cation contact 2-dimensional illustration of the concept of stability: C&R Figure 3.4 Lecture 12, spring 2010 ENGR 145, Chemistry of Materials Case Western Reserve University Coordination Number Based on Radius Ratios [C&R 3.6] (from C&R) 3.3 4 Lecture 12, spring 2010...
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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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L12CmpdCrStXRD145s10 - Lecture 12, spring 2010 ENGR 145,...

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