X-ray analysis of praseodymia
Bitte benutzen Sie diese Kennung, um auf die Ressource zu verweisen:
https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2009111311
https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2009111311
Langanzeige der Metadaten
DC Element | Wert | Sprache |
---|---|---|
dc.contributor.advisor | Prof. Dr. Joachim Wollschläger | |
dc.creator | Weisemöller, Thomas | |
dc.date.accessioned | 2010-01-30T14:38:14Z | |
dc.date.available | 2010-01-30T14:38:14Z | |
dc.date.issued | 2009-11-11T13:28:25Z | |
dc.date.submitted | 2009-11-11T13:28:25Z | |
dc.identifier.uri | https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2009111311 | - |
dc.description.abstract | In this thesis, it was shown that thin films of hexagonal praseodymium sesquioxide on Si(111) can be transformed to B-oriented twin free films of cubic praseodymium dioxide with oxygen vacancies by post deposition annealing in 1 atm. oxygen at temperatures from 300°C up to 700°C for 30 minutes. Films annealed at 100°C and 200°C are still purely hexagonal praseodymium sesquioxide after the annealing process. In the transformed films, two stoichiometric phases coexist laterally. The lateral lattice constant of both species is almost identical to the one of the originally deposited hexagonal praseodymium sesquioxide. Therefore, we assume that the lateral lattice constant is pinned throughout the oxidation process.The species are hence strained and show different vertical lattice constants, depending on the amount of oxygen vacancies. In some samples, those vacancies were partly ordered vertically, leading to a unit cell twice as large as expected for stoichiometric praseodymium dioxide.During the annealing process, an amorphous interfacial layer between substrate and oxide was detected. While the existence of this layer was known before, it was possible for the first time to quantify the thickness of the praseodymium rich part of this interface for epitaxially grown films. It was shown that this layer starts to grow significantly only during post deposition annealing at 500°C or more.These and other results for thin films were connected to previously published data for bulk praseodymia. The multi column model mentioned above for laterally coexisting praseodymia species in thin films was backed up by powder data. As a matter of fact, it was shown that this coexistence of several praseodymia species can be expected to be the rule rather than the exception.Strong evidence was found that results interpreted previously as stoichiometric cubic praseodymium sesquioxide contain more oxygen than originally thought... | eng |
dc.language.iso | eng | |
dc.subject | praseodymium | |
dc.subject | praseodymium oxide | |
dc.subject | Si(111) | |
dc.subject | silicon | |
dc.subject | XRD | |
dc.subject | X-ray diffraction | |
dc.subject | thin films | |
dc.subject | two column model | |
dc.subject | amorphous interface layer | |
dc.subject.ddc | 540 - Chemie | ger |
dc.title | X-ray analysis of praseodymia | eng |
dc.type | Dissertation oder Habilitation [doctoralThesis] | - |
thesis.location | Osnabrück | - |
thesis.institution | Universität | - |
thesis.type | Dissertation [thesis.doctoral] | - |
thesis.date | 2009-08-07T12:00:00Z | - |
elib.elibid | 952 | - |
elib.marc.edt | jost | - |
elib.dct.accessRights | a | - |
elib.dct.created | 2009-10-21T13:10:40Z | - |
elib.dct.modified | 2009-11-11T13:28:25Z | - |
dc.contributor.referee | apl. Prof. Prof. h.c. Dr. Dr. h.c. Manfred Neumann | |
dc.subject.dnb | 29 - Physik, Astronomie | ger |
dc.subject.pacs | 68.55.aj | eng |
dc.subject.pacs | 61.72.jd | eng |
dc.subject.pacs | 81.15.Hi - Molecular, atomic, ion, and chemical beam epitaxy | eng |
dc.subject.pacs | 61.66.Fn - Inorganic compounds | eng |
dc.subject.pacs | 61.05.cc | eng |
dc.subject.pacs | 61.05.cp | eng |
dc.subject.pacs | 77.55. f | eng |
vCard.ORG | FB4 | ger |
Enthalten in den Sammlungen: | FB06 - E-Dissertationen |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
---|---|---|---|---|
E-Diss952_thesis.pdf | Präsentationsformat | 8,77 MB | Adobe PDF | E-Diss952_thesis.pdf Öffnen/Anzeigen |
Alle Ressourcen im Repositorium osnaDocs sind urheberrechtlich geschützt, soweit nicht anderweitig angezeigt. rightsstatements.org