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problem_set2

# problem_set2 - positions± that is lying on the[100 faces...

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Materials 101 Introduction to Structure and Properties Winter 2010 Problem Set 2 Due 8:00am, Tuesday, January 26 Problem 1 Crystal Structures On the basis of ionic charge and ionic radii given in the table below, predict crystal structures for the following: a) CaO b) MnS c) KBr d) CsBr Problem 2 Crystal Structure Problem 3 Crystal Structure Compute the theoretical density of diamond given the C-C distance and bond angle are 0.154 nm and 109.5°, respectively. How does your answer compare to the measured density (state source for this value). Problem 4 Defects in crystalline structures

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Materials 101 Introduction to Structure and Properties Winter 2010 For both the FCC and BCC structures, there are two different types of interstitial sites. In each case, one site is larger than the other, and is normally occupied by impurity atoms. For FCC, this larger one is located at the denter of each edge of the unit cell; it is termed an octahedral interstitial site. On te other hand, with BCC, the larger site tpe is found at 0, ½, ¼
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Unformatted text preview: positions± that is, lying on the [100] 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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