2018 기계재료 HW2.docx - The Hexagonal Close-Packed Crystal Structure 4.4 For the HCP crystal structure show that the ideal c/a ratio is 1.633 4.7

2018 기계재료 HW2.docx - The Hexagonal Close-Packed...

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The Hexagonal Close-Packed Crystal Structure 4.4 For the HCP crystal structure, show that the ideal c / a ratio is 1.633. 4.7 Calculate the radius of an iridium atom, given that Ir has an FCC crystal structure, a density of 22.4 g/cm 3 , and an atomic weight of 192.2 g/mol. 4.21 Show that the minimum cation-to-anion radius ratio for a coordination number of 6 is 0.414. [ Hint : Use the NaCl crystal structure (Figure 4.5), and assume that anions and cations are just touching along cube edges and across face diagonals.] 4.25 Compute the atomic packing factor for the cesium chloride structure in which
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