• 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. AX Crystal Structures AX–Type Crystal Structures include NaCl, CsCl, and zinc blende 0. structure. 170 Cl Cs = = − + r r Adapted from Fig. 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. 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 2 939 0. 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. ... 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. 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. N = 1, so n Although Bragg's law was used to explain the interference pattern of X-rays scattered by crystals, diffraction has been . Zinc Blende (ZnS) Structure 181 0. 12.3, Callister 7e. The Bravais lattice of NaCl is FCC with the basis containing one Na ion. • 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), 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. Primitive Cells This is really simple! Crystal Structures Chapter 7 Wednesday, October 21, 2015. →Octahedron Connectivity →Edge sharing octahedra 4 NaCl in unit cell. The molecule is under equilibrium because, the attractive force due to ions is balanced by repulsive force due to electron clouds. • 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. 1we will see that the basic building blocks of periodic structures can be more complicated than a single atom. Structure Factor The general expression for : Now we apply this to various crystals. determining crystal structures beginning with NaCl, ZnS and diamond. 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