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homework 2[1].pdfCVEN306

homework 2[1].pdfCVEN306 - these with the values in your...

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Homework: CVEN 306, Section 502, Week 3, September 14, 2010 Due Date: September 16, 2010 Please answer the questions listed below in the following format: Given: Required: Solution: Each student must submit an individual answer. You may work with and communicate with others, but you must submit your own work. Assignment 1. What is the difference between atomic structure and crystal structure? 2. Show for the BCC crystal structure that the unit cell edge length a and the atomic radius R are related through a = 4R/3 0.5 . 3. 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 theoretical density with the experimental value found in your text. 4. Using atomic weight, crystal structure, and atomic radius data tabulated in your text, compute the theoretical densities of aluminum, nickel, magnesium, and tungsten, and then compare
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Unformatted text preview: these with the values in your text. The c/a ratio for magnesium is 1.624. 5. Beryllium has an HCP unit cell for which the ratio of the lattice parameters c/a is 1.568. If the radius of the Be atom is 0.1143 nm, (a) determine the unit cell volume, and (b) calculate the theoretical density of Be and compare it with the literature value. 6. Derive planar density expressions for FCC (100) and (111) planes in terms of the atomic radius R. 7. Derive planar density expressions for BCC (100) and (110) planes in terms of the atomic radius R. 8. Would you expect a material in which the atomic bonding is predominately ionic in nature to be more or less likely to form a noncrystalline solid upon solidification than a covalent material? Why?...
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