History and Bibliography of Diffusion -- History and Bibliography of Diffusion -- Fundamentals of Diffusion -- Continuum Theory of Diffusion -- Solutions of the Diffusion Equation -- Random Walk Theory and Atomic Jump Process -- Point Defects in Crystals -- Diffusion Mechanisms -- Correlation in Solid-State Diffusion -- Dependence of Diffusion on Temperature and Pressure -- Isotope Effect of Diffusion -- Interdiffusion and Kirkendall Effect -- Diffusion and External Driving Forces -- Irreversible Thermodynamics and Diffusion -- Experimental Methods -- Direct Diffusion Studies -- Mechanical Spectroscopy -- Nuclear Methods -- Electrical Methods -- Diffusion in Metallic Materials -- Self-diffusion in Metals -- Diffusion of Interstitial Solutes in Metals -- Diffusion in Dilute Substitutional Alloys -- Diffusion in Binary Intermetallics -- Diffusion in Quasicrystalline Alloys -- Diffusion in Semiconductors -- General Remarks on Semiconductors -- Self-diffusion in Elemental Semiconductors -- Foreign-Atom Diffusion in Silicon and Germanium -- Interstitial-Substitutional Diffusion -- Diffusion and Conduction in Ionic Materials -- Ionic Crystals -- Fast Ion Conductors -- Diffusion in Glasses -- The Glassy State -- Diffusion in Metallic Glasses -- Diffusion and Ionic Conduction in Oxide Glasses -- Diffusion along High-Diffusivity Paths and in Nanomaterials -- High-diffusivity Paths in Metals -- Grain-Boundary Diffusion -- Dislocation Pipe Diffusion -- Diffusion in Nanocrystalline Materials.