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crystal structure of nacl pdf

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

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