HW 3 ChE 350 F11(1) - parameter a . 4. X-ray diffraction...

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ChE 350 Fall 2011 Homework 3 (Due Tuesday, Sept. 27) Name:________________________ 1 1. NiO has rock salt structure. Using the ionic radii of Ni 2+ and O 2- listed in Table 12.3, determine the theoretical density of NiO. Compare this to the experimentally measured value. 2. Using the tabulated values of ionic radii in Table 12.3, predict the structure of MgO based on radius ratio rules. 3. An XRD pattern from a sample of KCl is shown below. The number of electrons in K + and Cl - are equal and therefore, the X-ray scattering amplitudes from these ions are nearly equal, so that K Cl f f . KCl has rock salt structure. From the X-ray data, determine the lattice
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Unformatted text preview: parameter a . 4. X-ray diffraction data from Lee, Bluemle and Bates [Discovery of a Frank-Kasper s Phase in Sphere-Forming Block Copolymer Melts, Science 2010, 330 , pgs 349-353] is shown below. (a) Show that the peak indexing as . , 6 , 5 , 4 , 3 , 2 , 1 * etc q q corresponds to a bcc lattice. (b) Determine the lattice parameter a , of the bcc unit cell. (c) Compare the value of a for this material to a typical lattice parameter value for an atomic crystal (i.e., Au, Si, etc.). ChE 350 Fall 2011 Homework 3 (Due Tuesday, Sept. 27) Name:________________________ 2...
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HW 3 ChE 350 F11(1) - parameter a . 4. X-ray diffraction...

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