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$Close packing in solids pdf: >> http://gvw.cloudz.pw/download?file=close+packing+in+solids+pdf << (Download) Close packing in solids pdf: >> http://gvw.cloudz.pw/read?file=close+packing+in+solids+pdf << (Read Online) solid state chemistry questions answers pdf solid state chemistry ppt solid state chemistry mcq pdf solid state chemistry pdf download solid state chemistry book free download basic concepts of solid state chemistry solid state chemistry pdf ncert solid state chemistry project class 12 •In order to understand or modify the properties of a solid, we need to know the structure of the material. •Crystal structures are usually determined by the technique of X-ray crystallography. •Structures of many inorganic compounds may be initially described in terms of simple packing of spheres. Solids. Close-Packing. This considers the solid as a close-packed array of atoms, with valence electrons completely delocalized throughout the extended structure. Since the delocalization of electrons occurs more readily for valence electrons farther from the nucleus (experiencing a lesser Zeff), metallic character increases going down a. 22 May 2013 1. close packing: guiding factor = realization of maximum density. 2. Space filling Packed Planes. Two possible stacking sequences: 1. ABCABC > Face centered cubic (f.c.c). 2. ABABAB> Hexagonal closed packed (h.c.p). 7. 5/22/2013. L. Viciu| Alloys (intermetallic phases or solid solutions). 3. How do atoms arrange themselves to form solids? • Fundamental concepts and language. • Unit cells. • Crystal structures. ?Simple cubic. ?Face-centered cubic. ? Body-centered cubic. ? Hexagonal close-packed. • Close packed crystal structures. • Density computations. • Types of solids. Single crystal. Polycrystalline. Solid State Physics. 28. Close-packed structure: When the atoms of a monatomic solid are imagined to be relatively incompressible spheres, they might be very tightly packed together in the most compact arrangement for spheres. [Note: This is expected since the cohesive energy for metallic and. Van der Waals bonding Chapter 3 - 8. • APF for a simple cubic structure = 0.52. APF = a. 3. 4. 3 ? (0.5a)3. 1 atoms unit cell atom volume unit cell volume. Atomic Packing Factor (APF). APF = Volume of atoms in unit cell*. Volume of unit cell. *assume hard spheres. Adapted from Fig. 3.24,. Callister & Rethwisch 8e. close-packed directions a. R="0".5a. Module 4 : Solid State Chemistry. Lecture 17 : Closed Packed Structures. Objectives. In this lecture, you will learn the following. The packing fraction. Evaluation of the packing fractions in simple cubic, FCC and BCC lattices. Estimate of the critical radius ratios for spherical particles that can be inserted in the holes of the atoms like noble gas atoms solidify in close-packed arrangement. The larger ion in ionic solids may also close-pack, with the smaller ion fitting in the tetrahedral or octahedral holes, depending on the ratio of the ionic radii. There are as many octahedral holes as close- packed sites, but only half as many tetrahedral holes as Face-Centered Cubic Structure (FCC). 24> atoms unit cell atom volume unit cell volume. ? APF for a face-centered cubic structure = 0.74. 3. 3. 4. 2. 3. 4. 4 a a. APF. ?. ?. ?. ?. ?$