NaCl (salt shaker variety) Hexagonal Close Packed: unit cell. 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. 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 Structure Factor The general expression for : Now we apply this to various crystals. Cesium Chloride structure: ∴ cubicsites preferred So each Cs + has 8 neighboring Cl- 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. • Ittellsuswhichreflections(ie peaksIt tells us which reflections (i.e., peaks , hkl)to) to expect in a diffraction pattern. N = 1, so n We can specify the structure of cesium chloride, for example, with only four pieces of →Octahedron Anion Coord. The Bravais lattice of NaCl is FCC with the basis containing one Na ion. AX Crystal Structures AX–Type Crystal Structures include NaCl, CsCl, and zinc blende 0. 12.3, Callister 7e. Although Bragg's law was used to explain the interference pattern of X-rays scattered by crystals, diffraction has been . Crystal Structure of Sodium Chloride(NaCl) NaCl is a ionic compound. As in NaCl, each ion is coordinated by six of the other kind. The molecule is under equilibrium because, the attractive force due to ions is balanced by repulsive force due to electron clouds. • Both the sodium chloride crystal and water crystal consist of repeating patterns. 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. structure. • The water crystal is a hexagon. • 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. 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. determining crystal structures beginning with NaCl, ZnS and diamond. 939 0. and one Cl ion. Crystal Structures Chapter 7 Wednesday, October 21, 2015. 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. ... 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