Lecture 3 - MSE 2620 / Lecture 3 Defects, Kinetics, Phase...

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MSE 2620 – Kasap 3 rd Ed MSE 2620 / Lecture 3 Defects, Kinetics, Phase Diagrams Introduction to Conduction in Metals Reading: Kasap 1.9, 1.12 Kasap 2.1 – 2.2
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MSE 2620 – Kasap 3 rd Ed Choose your favorite (among these) A: Get Fuzzy B: FoxTrot C: Dilbert D: Far Side E: XKCD
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MSE 2620 – Kasap 3 rd Ed Review
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MSE 2620 – Kasap 3 rd Ed Bravais Lattices How many crystal systems and Bravais lattices exist? (cubic is a system, FCC a lattice) a) 5 systems, 24 lattices b) 7 systems, 12 lattices c) 7 systems, 14 lattices d) 7 systems, 17 lattices e) 9 systems, 18 lattices
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MSE 2620 – Kasap 3 rd Ed What is the lattice and basis? a) Cubic, Cl at (000) and Cs at (½, ½, ½) b) Body centered cubic, Cl at (000) and Cs at (½, ½, ½) c) Face centered cubic, Cl at (000) and Cs at (½, ½, ½) d) Body centered cubic, no basis atoms e) Simple cubic, no basis atoms since ionic Cl . Cs +
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MSE 2620 – Kasap 3 rd Ed What type of plane is represented here? a) {001} b) {010} c) {110} d) {111} e) {210}
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MSE 2620 – Kasap 3 rd Ed Crystal Defects and Structures
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MSE 2620 – Kasap 3 rd Ed (a) Perfect crystal without vacancies (b) An energetic atom at the surface breaks bonds and jumps on to a new adjoining position on the surface. This leaves behind a vacancy. (c) An atom in the bulk diffuses to fill the vacancy thereby displacing the vacancy towards the bulk. (d) Atomic diffusions cause the vacancy to diffuse into the bulk. Generation of a vacancy by the diffusion of an atom to the surface and the subsequent diffusion of the vacancy into the bulk.
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rd Ed (a) A vacancy in the crystal. (b) A substitutional impurity in the crystal. The impurity atom is larger than the host atom. (c) A substitutional impurity in the crystal. The impurity atom is smaller than the host atom. (d) An interstitial impurity in the crystal. It occupies an empty space between host atoms. Point defects in the crystal structure. The regions around the point
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Lecture 3 - MSE 2620 / Lecture 3 Defects, Kinetics, Phase...

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