The Bravais lattice of NaCl is FCC with the basis containing one Na ion. Structure Factor (Fhkl) 2( ) 1 ij i N ihu kv lw hkl i i Ffe • Describes how atomic arrangement (uvw) influences the intensity of the scattered beam. • Both the sodium chloride crystal and water crystal consist of repeating patterns. Zinc Blende (ZnS) Structure Crystal Structures Chapter 7 Wednesday, October 21, 2015. The calcite (CaCO 3) crystal structure is shown above.Triangular CO 3 2-ions fill octahedral holes between the Ca 2+ ions (black spheres) in a distorted NaCl lattice. 170 Cl Cs = = − + r r Adapted from Fig. The molecule is under equilibrium because, the attractive force due to ions is balanced by repulsive force due to electron clouds. Differences • The sodium chloride crystal is a cube. AX Crystal Structures AX–Type Crystal Structures include NaCl, CsCl, and zinc blende 0. structure. ... NaCl Structure CCP with all octahedral holes filled Coordination= 6, 6 Cation Coord. 939 0. NaCl (salt shaker variety) Hexagonal Close Packed: unit cell. determining crystal structures beginning with NaCl, ZnS and diamond. • Structure of NaCl CERAMIC STRUCTURE (1) This structure can be described as having FCC Bravais lattice with two ions (1Na+ and 1Cl-) ... • The unique relationship between such patterns and crystal structures provide a powerful tool for identification of the phase composition of powders and polycrystalline materials. We can specify the structure of cesium chloride, for example, with only four pieces of Crystal Structure of Sodium Chloride(NaCl) NaCl is a ionic compound. →Octahedron Anion Coord. Structure Factor The general expression for : Now we apply this to various crystals. and one Cl ion. 1 (The text is taken from: Basic Solid State Chemistry, by Anthony R. West) 1.17 Some important structure types a) Rock salt (NaCl), zinc blende or sphalerite (ZnS), fluorite (CaF2), antifluorite (Na2O) These structures are considered together because they all have ccp/fcc anions and differ only in the positions of the cations. N = 1, so n • All of the faces of the sodium chloride crystal are square, but can have different number of ions: 4 (2 x 2 x 2), 9 (3 x 3 x 3), First, consider examples of crystals with a basis group of just one atom per lattice point, with atomic scattering factor f. The results are valid for any crystal system. Although Bragg's law was used to explain the interference pattern of X-rays scattered by crystals, diffraction has been . 12.3, Callister 7e. • Ittellsuswhichreflections(ie peaksIt tells us which reflections (i.e., peaks , hkl)to) to expect in a diffraction pattern. From this image we can see why the CaCO 3 structure has a lower symmetry than that of NaCl. 181 0. Hence both Na and Cl are in ionic state. 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