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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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 Spring '08
 Grasley

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