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HWCH3Spring - 3 Introduction to Materials Science...

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Homework Ch. 3 2 Introduction to Materials Science 3.2 What is the difference between a crystal structure and a crystal system? 3.8 Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute and compare its density with the experimental value of 7.87 g/cm3. 3.15 Below are listed the atomic weight, density, and atomic radius for three hypothetical alloys. For each determine whether its crystal structure is FCC, BCC, or simple cubic and then justify your determination. A simple cubic unit cell is shown in Figure 3.22.
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Unformatted text preview: 3 Introduction to Materials Science 3.29. (13.15) On the basis of ionic charge and ionic radii, predict the crystal structures for the following materials: (a) CsI, (b) NiO, (c) KI, and (d) NiS. Justify your selections. 3.46 In terms of bonding, explain why silicate materials have relatively low densities. 3.51 Within a cubic unit cell, sketch the following directions: (a) [110]; (b) [121]; (c) [012]; (d) [133]; (e) [111]; (f ) [122]; (g) [123]; (h) [103]. 3.58 Determine the Miller indices for the planes shown in the following unit cell:...
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