2 ISSUES TO ADDRESS... • How do atoms assemble into solid structures?(for now, focus on metals) • How does the density of a material depend onits structure? • When do material properties vary with theorientation in a crystal? (Isotropic vs. anisotropic)? The Structure of Crystalline Solids
3 • Non dense, random packing • Dense, ordered packing Dense, ordered packed structures tend to have lower energies, i.e. thermodynamically more stable Energy and Packing Energy r typical neighbor bond length typical neighbor bond energy Energy r typical neighbor bond length typical neighbor bond energy
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