Lecture 3 - Revision-1

Lecture 3 - Revision-1 - 2 Crash Revision of...

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2 Crash Revision of Basics (approximately 1 week, maybe less) 2.2 Basic Elasticity Definition of Stress field 2.3 Survey of Types of Point Defects Substitutional Defects Vacancies, Interstitials Shottky Defects, Frankel Defects F Centers Non-Stoichiometric Defects Basic Chemistry of Substitutional Defects in Ceramics Kroger-Vink Notation (later) 2.4 Edge, Screw and Mixed Dislocations Basic Definition/Description Glide, Climb and Dislocation Reactions 2.5 Boltzmann, Fermi-Dirac and Bose-Einstein Distributions Target: quick (incomplete) coverage of some basics. Elasticity Stresses Very much the same way as we talk about strains, we can define stresses as tensors: σ xx , σ yy , σ zz and shear stresses σ xy etc. These can be defined in cartesian co-ordinates, or in others such as cylindrical and spherical polar coordinates. We can interpret σ ij (where i and j are some combination of axes, e.g. x,y) as the force along j for a surface whose normal is along i. For anisotropic case (i.e. real crystals) the relationship between stress and strain can get quite complicated. For the isotropic case it is relatively easy. The forms are:
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Lecture 3 - Revision-1 - 2 Crash Revision of...

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