ECE331 Wi11 lecture 3_sar

ECE331 Wi11 lecture 3_sar - The Structure of Crystalline...

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he Structure of Crystalline Solids The Structure of Crystalline Solids ISSUES TO ADDRESS. .. How do atoms assemble into solid structures? How does the density of a material depend on its structure? When do material properties vary with orientation?
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Energy and Packing Non dense, random packing Energy pical neighbor r typical neighbor bond length typical neighbor Dense, ordered packing bond energy Energy typical neighbor bond length ense ordered packed structures tend to have r typical neighbor bond energy Dense, ordered packed structures tend to have lower energies.
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Materials and Packing atoms pack in periodic, 3D arrays Crystalline materials. .. -metals -many ceramics -some polymers rystalline SiO typical of: py oncr stalline aterials crystalline SiO 2 Adapted from Fig. 3.22(a), Callister 7e. Si Oxygen atoms have no periodic packing Noncrystalline materials. .. -complex structures occurs for: -rapid cooling noncrystalline SiO 2 " Amorphous " = Noncrystalline Adapted from Fig. 3.22(b), Callister 7e.
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This note was uploaded on 04/30/2011 for the course ECE 331 taught by Professor Rajan during the Spring '09 term at Ohio State.

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ECE331 Wi11 lecture 3_sar - The Structure of Crystalline...

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