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Unformatted text preview: positions± that is, lying on the  faces, and situated midway between two unit cell edges on this face and one-quarter of the distance between the other two unit cell edges. For both FCC and BCC crystal structures, compute the radius r of an impurity atom that will just fit into one of these sites in terms of the atomic radius R of the host atom. Problem 5 Defects in crystalline structures Iron and vanadium both have the BCC crystal structure, and V forms a subsitutional solid solution for concentrations up to approximately 20 wt % V at room temperature. Compute the unit cell edge length for a 90 wt % Fe ² 10 wt % V alloy. Problem 6 Defects in Crystals a) Name the two ³pure´ line defects in crystals, and for each, draw a line and describe the magnitude and direction of the lattice distortion they produce within a crystal b) Name the three interfacial defects. For each, describe their location and what they do....
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- Spring '09
- Crystal, Crystallographic database