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