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Lecture14 - ENGR 2220 Structure Properties of Materials...

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ENGR 2220 ENGR 2220 – Structure & Properties of Materials Lecture 14 Structures & Properties of Ceramics Chapter 12, 13
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Coordination # and Ionic Radii Coordination # increases with r cation r anion Issue: How many anions can you r cation Coord ZnS (zincblende) arrange around a cation? 2 r anion # < 0.155 0 155 0 225 3 linear t i l Adapted from Fig. 12.4, Callister 7e. N Cl 0.155 - 0.225 0.225 - 0.414 3 4 triangular T D Adapted from Fig. 12 2 C lli t 7 NaCl (sodium chloride) 0.414 - 0.732 0 732 1 0 6 8 O H bi 12.2, Callister 7e. CsCl (cesium chloride) Adapted from Table 12.2, Callister 7e. 0.732 - 1.0 cubic Adapted from Fig. 12.3, Callister 7e.
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