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Unformatted text preview: nearest neighbor lengths is greater than 90°, we have to use the complementary angle of 180°  70.5V = 109°, which means our roundoff hasn’t been quite correct. 1.11 The crystal structure of sodium chloride (NaCl) is a simple cubic with the Na and Cl atoms alternating positions. Each Na atom has six neighbors and likewise each Cl atom has six neighbors. (a) Sketch the atoms in a (100) plane. (b) Assume the atoms are hard spheres with nearest neighbors touching. The effective sodium radius is 0.1 nm and the effective Cl radius is 0.18 nm. Determine the lattice constant. (c) Calculate the volume density of Na and Cl atoms. (d) Calculate the mass density of NaCl. (a) The (100) plane is one face of the cube, and this looks as (b) The cube edge is the sum of the two atomic radii, or 0.28 nm, and this is the lattice constant. (c) The cube has eight corners, each of which is shared with 8 cubes, so that the unit...
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This document was uploaded on 02/19/2014.
 Fall '14

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