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        | Which 3 material classes can form crystal structures? |  | Definition 
 
        | Metals, ceramics, polymers |  | 
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        | Tiles space without any gaps or holes. |  | 
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        | FCC stacking sequence vs. HCP stacking sequence |  | Definition 
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        | As coordination number increases, radius ratio ______. |  | Definition 
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        | Difference between x-ray constructive interference and destructive interference? |  | Definition 
 
        | Destructive interference is the straight line wave. |  | 
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        | How many valid 3D lattices are there? |  | Definition 
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        | What are the 3D lattices called? |  | Definition 
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        | Made up of "grains"; small crystalline regions that are disoriented from one another |  | 
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        | Internal surfaces of finite thickness where crystals of different orientations meet |  | 
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        | Materials which change their crystal structure at specific temps |  | 
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 | Definition 
 
        | Material property that is independent of direction |  | 
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        | When material properties depend on direction |  | 
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        | Which structures have a close-packed plane? |  | Definition 
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