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Title: Structural studies of amorphous materials
Author: Chou, Yu-Jen
ISNI:       0000 0004 7430 607X
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2018
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Amorphous materials have attracted interest due to their unique properties as many common objects and industrially important components are made of amorphous materials. To understand their properties, building structure-property correlations is an important step. Typically, amorphous materials are investigated by X-ray or neutron diffraction, but due to the relatively large interaction volumes for both probes, these techniques are not suitable for studying materials with nanovolumes. In contrast, electron probes can be focused on specifically chosen nanoscale areas and data from electron diffraction patterns can be transformed into a reduced density function (RDF) which describes the distribution of nearest-neighbour distances at high precision. In this thesis, using electron diffraction based RDF techniques I have studied the effects of various factors on the RDF. In addition, Density Functional Theory (DFT) simulations and Reverse Monte Carlo (RMC) refinements were performed to support the interpretation of the experimental RDF results. Finally, two industrial important materials, bioactive glass and metallic glass, were examined. A possible structure-property correlation in bioactive glasses is proposed while an analytical RDF technique was developed for the construction of metallic glass models.
Supervisor: Borisenko, Konstantin ; Kirkland, Angus Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available