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Interpretation of an X-Ray diffraction pattern




I need an introduction related to this topic or a proper paraphrasing of this;Interpretation of an X-Ray diffraction pattern;3.1 Introduction;We say that a material is crystalline when its atoms are all arranged in a geometrical pattern called a lattice.;Metals are crystalline, as well as ceramics, salts, and some polymers. This atomic arrangement is periodic;which means that the structure contains a series of atomic planes oriented in dierent directions inside the;lattice. Each atomic plane is repeated periodically in the lattice, generating a family of parallel planes;separated by a distance d called the d-spacing". Each family of planes can be fully characterized by its;d-spacing" and its orientation in the unit cell, which is dened by its Miller indices (h, k and l).;It can be shown that every crystalline structure has families of planes with dierent d-spacings for a given;orientation, this is what allows us to dierentiate one structure from another. No two crystals of dierent;chemical composition can have the same set of d-spacings. Since the d-spacings are directly related to the;unit cell parameters of the crystal, if we can somehow obtain a set of d-spacings for a substance we can;determine what that substance is.;This peculiar description of crystalline lattices is of great practical importance as it provides a way to;experimentally probe and determine crystal structures using X-ray diraction.


Paper#16099 | Written in 18-Jul-2015

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