Lect18_notes

A unit cell is the smallest unit that can be repeated

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Unformatted text preview: lattice is a mathematical construction of a network of points or single motifs that is translated and repeated through space in 2D or 3D! •  A unit cell is the smallest unit that can be repeated in space to construct the lattice! •  The vectors that connect equivalent lattice points and define the edges of the unit cell are the crystallographic axes.! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 16 ! 13 Lattice! What is required to define the unit cell? How many lattice points in this unit cell? Are all the atoms sitting on lattice points?! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 16 ! 14 Two Dimensional Crystals! Graphite - The atoms are bonded together in sheets, where strong bonding exists between the atoms in the sheets, while the individual sheets are held together by weak bonding (van der Walls).! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Atomic Structure vs the Lattice! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 16 ! 15 CBEMS 164 – XRD, SEM &...
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This note was uploaded on 01/16/2014 for the course CBEMS 164 taught by Professor Porter,j during the Fall '08 term at UC Irvine.

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