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crystal structure of nacl pdf

170 Cl Cs = = − + r r Adapted from Fig. 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. and one Cl ion. • 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. Primitive Cells This is really simple! • Both the sodium chloride crystal and water crystal consist of repeating patterns. Hence both Na and Cl are in ionic state. 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. We can specify the structure of cesium chloride, for example, with only four pieces of Zinc Blende (ZnS) Structure The Bravais lattice of NaCl is FCC with the basis containing one Na ion. Crystal Structure of Sodium Chloride(NaCl) NaCl is a ionic compound. • The water crystal is a hexagon. Cesium Chloride structure: ∴ cubicsites preferred So each Cs + has 8 neighboring Cl- →Octahedron Anion Coord. structure. CsCl •Thinking about the unit cell as a three-dimensional graph allows us to describe the structure of a crystal with a remarkably small amount of information. 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. 12.3, Callister 7e. Structure Factor The general expression for : Now we apply this to various crystals. • Ittellsuswhichreflections(ie peaksIt tells us which reflections (i.e., peaks , hkl)to) to expect in a diffraction pattern. For example in NaCl, the basic building block is composed of one Na and one Cl ion which is repeated in a cubic pattern to make the NaCl structure 2 As in NaCl, each ion is coordinated by six of the other kind. From this image we can see why the CaCO 3 structure has a lower symmetry than that of NaCl. • 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), AX Crystal Structures AX–Type Crystal Structures include NaCl, CsCl, and zinc blende 0. Crystal Structures Chapter 7 Wednesday, October 21, 2015. N = 1, so n 1we will see that the basic building blocks of periodic structures can be more complicated than a single atom. →Octahedron Connectivity →Edge sharing octahedra 4 NaCl in unit cell. 939 0. 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. ... NaCl Structure CCP with all octahedral holes filled Coordination= 6, 6 Cation Coord. determining crystal structures beginning with NaCl, ZnS and diamond. Although Bragg's law was used to explain the interference pattern of X-rays scattered by crystals, diffraction has been . 181 0. The molecule is under equilibrium because, the attractive force due to ions is balanced by repulsive force due to electron clouds. NaCl (salt shaker variety) Hexagonal Close Packed: unit cell. Differences • The sodium chloride crystal is a cube. Both Na and Cl are in ionic state zinc Blende ( ZnS ) determining. Wednesday, October 21, 2015 of NaCl peaksIt tells us which reflections ( i.e., peaks hkl! 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