Materials Science 104-Lecture 2 Notes

Materials Science 104-Lecture 2 Notes - Materials Science...

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Materials Science 104 Lecture 2 Crystal Structure -Atoms may assemble into crystalline or amorphous structures -Common structures: FCC, BCC, HCP -Coordination Number, Atomic Packing Factor -We can predict the density if we know the atomic weight, radius, and geometry -Crystallographic points, directions, and planes are specified in terms of indexing schemes -Crystallographic directions and planes are related to atomic linear densities and planar densities Crystallographic Directions and Plane Working on 3D -Crystallographic direction is a vector -Any two vectors parallel to each other are equal and have the same indices -Crystallographic directions are defined by indices [u v w] > u = reduced projection along x-axis > v = reduced projection along y-axis > w = reduced projection along z-axis *Reduced means smallest integer values -Negative directions indicated by a “-“above the integer **See Examples** Crystallographic Planes -Any two parallel planes are equivalent and have identical indices -Planes are specified by 3 miller indices (h, k, l)
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Materials Science 104-Lecture 2 Notes - Materials Science...

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