CELL445 Chapter Notes -Hypotenuse, Close-Packing Of Equal Spheres, Cubic Crystal System
6 Mar 2014
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Make an informed decision by picking your exam. You should be able to do q 1 5, 7. We assume that the particles themselves are spheres and not cubes. For particles of the same size, the higher the coordination of the crystal the greater the number of particles in a given volume. Both hexagonal closest packing, hcp, (based on hexagonal unit cell) and cubic closest packing, ccp, (based on fcc unit cell) provide 74% packing efficiency. A video clip for simple cubic, body centered cubic, face centered cubic, packing and the nacl and zns crystal structures was shown in class. I recommend that you view it or even download it. For nacl and zns, check for yourself that the empirical formula based on the number of particles in the unit cell matches the known formula. At room temperature, iron crystallizes in the bcc structure. The edge of the cubic cell is found to be.
