Chem Lecture Notes Solids Close Packing

Chem Lecture Notes Solids Close Packing - Next: Symmetry...

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Unformatted text preview: Next: Symmetry and Space Group of Close-Packed Up: Close-Packed Structures Previous: Close-Packed Structures Voids in a Close-Packing In case of close-packed inorganic compounds, the larger atoms or ions occupy positions approximately corresponding to those of equal spheres in a close- packing while the smaller atoms are distributed among the voids. Three- dimensional close-packings of spheres have two kinds of voids: (i) If the triangular void in a close-packed layer has a sphere directly over it, there results a void with four spheres around it, as shown in Fig. 2a. Such a void is called a tetrahedral void since the four spheres surrounding it are arranged on the corners of a regular tetrahedron (Fig. 2b). If denotes the radius of the four spheres surrounding a tetrahedral void, the radius of the spheres that would just fit into this void is given by 0.225 . R 2,5 R (ii) If a triangular void pointing up in one close-packed layer is covered by a triangular void pointing down in the adjacent layer, then a void surrounded by six spheres results (Fig. 2c). Such a void is called an octahedral void adjacent layer, then a void surrounded by six spheres results (Fig....
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This note was uploaded on 05/26/2010 for the course CHEM 416 taught by Professor Staff during the Fall '08 term at University of Washington.

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Chem Lecture Notes Solids Close Packing - Next: Symmetry...

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