Lect18_notes

Which represents a space group cbems 164 xrd sem

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Unformatted text preview: ; Microanalysis: Lecture 16 ! 16 M.C. Escher Drawings! Optical Illusions! ! ! ! M.C. Escher Drawings – Symmetry Elements versus Space Groups! Identify the Symmetry Elements. Which represents a space group?! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 16 ! 17 M.C. Escher Drawings – Identifying the Unit Cell and Space Group! Identify the Symmetry Elements. Which represents a space group?! ! ! ! CBEMS 164 – XRD, SEM & Microanalysis: Lecture 16 ! 18 Primary Uses of EBSD! •  Measurement of grain orientations •  Phase identification by use of crystallographic parameters such as plane spacing and crystal symmetry •  Used together, EBSD can simultaneously assign a grain to a crystal structure and plot its phase and orientation in a map CBEMS 164 – XRD, SEM & Microanalysis: Lecture 16 ! 19 Crystallographic Contrast! •  •  •  •  The crystallographic arrangement of atoms can influence the backscattering of grains If a parallel beam of electron illumination intercepts a crystal surface in different directions, it will encounter different atom densities. In along certain direct...
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