Degree Type

Dissertation

Date of Award

1995

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

First Advisor

Alan I. Goldman

Abstract

Over the past ten years the quality and size of aperiodic crystals has steadily increased. This raises some interesting issues regarding the limitations of structural perfection attainable in non periodic solids. Results from a coherent x-ray diffraction experiment on an icosahedral Al-Pd-Mn quasicrystal, as well as direct evidence of dynamical diffraction of x-rays from quasicrystals are presented. In particular, the anomalous transmission of x-rays (the Borrmann effect), the Borrmann Fan, and Pendellosung fringe patterns have been observed. These measurements show that nearly perfect quasicrystals may be grown to centimeter-size dimensions thus implying the feasibility of performing a large range of measurements based on the study of perfect crystals. In addition, the dynamical theory of diffraction is applicable to the study of aperiodic crystals.

DOI

https://doi.org/10.31274/rtd-180813-10090

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Stefan Walenty Kycia

Language

en

Proquest ID

AAI9531758

File Format

application/pdf

File Size

127 pages

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