- About
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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 1 to 10 of 2065 (0.021 seconds)| 1 |
Long range order in quaternary oxidesWoodward, Patrick M. 22 November 1996 (has links)
Graduation date: 1997
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NMR study of novel oxidesRoberts, Neil (Neil Gregory) 03 December 2004 (has links)
Graduation date: 2005
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The formation and growth of ferromanganese oxides on the Nazca PlateLyle, Mitchell 21 June 1978 (has links)
Graduation date: 1979 / Best scan available for tables. Original is a black and white photocopy.
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Perturbed angular correlation spectroscopy of defects in CeriaWang, Ruiping 03 May 1991 (has links)
Graduation date: 1991
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Charge trapping in nano-structured semiconducting oxidesMacdonald, Iain January 2013 (has links)
This thesis explores the low temperature dynamics of photo-generated charges in titanium dioxide; with particular reference to the rutile polymorph. The phenomenon of charge trapping in anatase has been heavily investigated using electron paramagnetic resonance (EPR) spectroscopy, whereas the rutile polymorph has been given very little attention. An understanding of charge trapping dynamics in semiconductors, such as titanium dioxide, is of key importance to advancing technologies such as photocatalysis. The research contained in this thesis examines charge trapping in a number of rutile systems, nano- and micro-structured, and compares these finding with those of the anatase polymorph. For contrast, a similar EPR study was carried out on a hematite; an iron oxide semiconductor. The data highlights some interesting differences between the rutile and anatase polymorphs. Firstly, the trapped electrons in rutile are particularly sensitive to being re-excited to the conduction band by the further absorption of photons; as is not the case in anatase. This phenomenon has been termed in this work as a dynamic equilibrium between trap site and conduction band. Secondly, the observation of paramagnetic holes is very difficult in rutile systems, leading to the hypothesis of hydroxyl radical dimerisation; producing hydrogen peroxide of the surface. This hypothesis was formed following an extensive study of the effects of surface hydration. Most importantly, a number of distinctly different trapped electron species were observed in the rutile samples. The two main trapped electron species have been assigned to; i) an electron residing on a surface titanium ion associated with a hydroxyl group and ii) a sub-surface titanium ion residing in either a lattice or an interstitial site. Finally, the study conducted on Hematite at low temperature, shows evidence for a transition from ferromagnetism to superparamagnetism during broadband irradiation. An attempt to rationalise this observation is given within.
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The structural and electrical characterisation of palmierite oxides and their derivativesWildman, Eve Jennifer January 2013 (has links)
No description available.
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Synthesis, characterisation and structural investigations of nanoparticulate forms of selected (W, Ti, Al, Ba) mixed metal oxidesFranklyn, Paul John January 2012 (has links)
No description available.
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The synthesis of a dense ferrochromite (FeO-Cr₂O₃)Farrell, John Jeffrey 08 1900 (has links)
No description available.
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Phase Equilibrium for Solid and Molten Ce0 [subscript 2]-[subscript x] Above 1500°CWatson, Michael David 08 1900 (has links)
No description available.
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Surface characteristics and support interactions of a new metal oxide cluster compoundBabb, Kenneth H. 05 1900 (has links)
No description available.
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