Multiple Bragg scattering in decagonal quasicrystals
Abstract
The purpose of this research is to perform a comparative study upon closely-related quasicrystalline materials. Three decagonal quasicrystals of compositions $Al\sb{68}Cu\sb{11}Co\sb{21},\ Al\sb{71}Ni\sb{24}Fe\sb5,$ and $Al\sb{72.5}Ni\sb{16.5}Co\sb{11}$ are studied using x-ray diffraction techniques. Multiple Bragg Scattering studies reveal that none of the samples is centrosymmetric. X-ray precession photography and Multiple Bragg Scattering together provide qualitative insights into the similarities and differences between the three compositions. In particular, the intensities, locations, and appearances of the Multiple Bragg Scattering peaks reveal features of the $Al\sb{68}Cu\sb{11}Co\sb{21}$ system that are not present in the other two systems.
Degree
Ph.D.
Advisors
Colella, Purdue University.
Subject Area
Condensation
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