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section%204.7%20-%20ionic%20defects

section%204.7%20-%20ionic%20defects - 4.7 Defects in Ionic...

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4.7 Defects in Ionic Crystals Objectives Determine types of defects in ionic crystals. Just like metallic crystals, ionic crystals can have defects. The difference is that when we identify the types of defects present in ionic crystals we need to consider how those defects affect the overall charge on the crystal. Figure 4.7.1 shows a defect in an NaCl crystal. We will use this figure to start to understand the types of defects that can form in an ionic crystal. Figure 4.7.1: Schematic diagram of an NaCl crystal after the formation of an Na + vacancy. GI 4.7.1 What is the charge on the crystal before the vacancy is formed? GI 4.7.2 What is the charge on the crystal after the vacancy is formed? GI 4.7.3 What should the charge on an ionic crystal be? GI 4.7.4 Describe two possible ways to change the crystal shown so that the charge on the crystal matches your answer to GI 4.7.3.
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The two types of defects you identified in GI 4.7.4 have specific names. Figure 4.7.2 shows a cation vacancy paired with an anion vacancy, which is called a Schottky defect after Walter H. Schottky.
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