MSE664A - Solid State Ionics

Perfect Structure, Defects in Elemental Solid and Ionic Compound, Defect Classes, Point Defects, Kröger-Vink Notation for Point Defects, Point Defect Formation & Equilibrium, Law of Mass-action, Thermodynamic Related to Intrinsic Defects and Defect Reactions. Complexes Containing an Impurity Center and an Ionic Defect, Intrinsic Ionic Defect Associates and Effect of Impurities on the Concentration of Defect Complexes and Associate. Basic Concepts of Diffusion, Tracer Diffusion, Self Diffusion, Chemical Diffusion, Ambipolar Diffusion, Ionic Conduction in Crystalline Solid, Intrinsic and Extrinsic Ionic Conduction, Transference Number, Nernst-Einstein Relationship, and Conductivity- Diffusion Relationship. Defect Equilibria in Pure and Stoichiometric Compounds with Schottky Defects, Frenkel Defect Pairs and Intrinsic Ionization of Electrons, Defect Equilibria in Non-stoichiometric Oxides such as Oxygen Deficient Oxide, Oxide with excess Metal, Metal Deficient Oxide, Metal Oxide with Excess Oxygen. Brouwer Diagrams for YSZ, Undoped and Doped CeO2, TiO2 and BaTiO3. Electrical Characterization Techniques such as AC Electrochemical Impedance Spectroscopy, Four Point Probe D.C. Method, Van Der Pauw Method, I-V Curves, Blocking Electrodes, and Hebb-Wagner Method. Open Circuit Potential, Efficiency, Nernst Equation Analysis, Activation Losses (Tafel Equation), Ohmic Losses, Concentration Losses. Description of Operation, Configurations, Cell Components, Materials Requirements, Manufacturing Techniques, and Performance of the following electrochemical devices such as Solid Oxide Fuel Cells, Gas Sensors and Batteries