5.1: Prelude to Metals and Alloys 5.2: Unit Cells and Crystal Structures 5.3: Crystal Structures of Metals 5.3.1: Conduction in Metals 5.4: Atomic Orbitals and Magnetism 5.4.1: Ferro-, Ferri- and Antiferromagnetism 5.4.2: Hard and Soft Magnets 5.4.3: Defects in Metallic Crystals 5.5: X-ray Crystallography 5.5.1: Miller Indices (hkl) 5.5.2: Powder X-ray Diffraction 5.6: Prelude to Ionic and Covalent Solids - Structures 5.6.1: Close-packing and Interstitial Sites 5.6.2: Structures Related to NaCl and NiAs 5.6.3: Tetrahedral Structures 5.6.4: Layered Structures and Intercalation Reactions 5.6.5: Spinel, Perovskite, and Rutile Structures 5.7: Ionic Radii and Radius Ratios 5.8: Energetics of Crystalline Solids- The Ionic Model 5.8.1: Born-Haber Cycles for NaCl and Silver Halides 5.8.2: Lattice Energies and Solubility 5.8.3: Kapustinskii Equation 5.9: Electronic Properties of Materials - Superconductors and Semiconductors Moving from atoms to molecules, we made linear combinations to generate one-electron molecular orbitals (and, in solids, one-electron energy bands). But as in multi-electron atoms, life is not so simple for real molecules and solids that contain many electrons. Electrons repel each other and so their movement in molecules and in solids is correlated. 5.9.1: Prelude to Electronic Properties of Materials - Superconductors and Semiconductors 5.9.2: Superconductors 5.9.3: Periodic Trends- Metals, Semiconductors, and Insulators 5.9.4: Semiconductors- Band Gaps, Colors, Conductivity and Doping 5.9.5: Semiconductor p-n Junctions 5.9.6: Diodes, LEDs and Solar Cells 5.9.7: References