crystal structure of nacl pdf

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