structure. Although Bragg's law was used to explain the interference pattern of X-rays scattered by crystals, diffraction has been . determining crystal structures beginning with NaCl, ZnS and diamond. →Octahedron Connectivity →Edge sharing octahedra 4 NaCl in unit cell. Primitive Cells This is really simple! Crystal Structures Chapter 7 Wednesday, October 21, 2015. Structure Factor The general expression for : Now we apply this to various crystals. • 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. ... NaCl Structure CCP with all octahedral holes filled Coordination= 6, 6 Cation Coord. 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. 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. 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. Crystal Structure of Sodium Chloride(NaCl) NaCl is a ionic compound. • The water crystal is a hexagon. • 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. 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 1we will see that the basic building blocks of periodic structures can be more complicated than a single atom. 170 Cl Cs = = − + r r Adapted from Fig. Hence both Na and Cl are in ionic state. →Octahedron Anion Coord. 12.3, Callister 7e. 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. The Bravais lattice of NaCl is FCC with the basis containing one Na ion. Differences • The sodium chloride crystal is a cube. 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. 181 0. N = 1, so n Zinc Blende (ZnS) Structure As in NaCl, each ion is coordinated by six of the other kind. 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