<div class="csl-bib-body">
<div class="csl-entry">Pölzleitner, F. J. (2017). <i>Polarity compensation on KTaO3(001) surfaces</i> [Diploma Thesis, Technische Universität Wien]. reposiTUm. https://doi.org/10.34726/hss.2017.50392</div>
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dc.identifier.uri
https://doi.org/10.34726/hss.2017.50392
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/5740
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dc.description
Abweichender Titel nach Übersetzung der Verfasserin/des Verfassers
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dc.description.abstract
This master thesis is focused on the structure of the KTaO3 (001) surface. Along this direction the cleaved surface is polar and several polarity compensation mechanisms are found depending on the applied conditions. In vacuum the as-cleaved surface consists of a mixture of bulk terminated KO and TaO2 terminated regions. At room temperature defect formation is observed and annealing results in rearrangement of the terraces, while the (1×1) termination is retained. The rearranged surface shows a labyrinthine structure with lines of 4-5 atoms width. This reconstruction is stable for annealing temperatures of up to 723 K. Exposure to water results in a hydroxylated surface and the formation of an overlayer with a (2×1) periodicity. The hydroxylated surface is stable for annealing temperatures of ~373 K and starts to decompose at annealing temperatures of ~473 K. Cleaved KTaO3 single crystals, which are doped by Ba, Yb and Cu, were investigated by atomic force microscopy (AFM), scanning tunneling microscopy (STM), low energy ion spectroscopy (LEIS), X-ray photoelectron spectroscopy (XPS) and low energy electron diffraction (LEED) under ultrahigh vacuum conditions. Experimental details with regard to the sample preparation and the influence of the applied surface science techniques are given. Structural models are proposed based on these experimental results and the stability of these structures is discussed.
en
dc.language
English
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dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
Oberflächenphysik
de
dc.subject
Rastersondenmikroskopie
de
dc.subject
Polare Oxidoberflächen
de
dc.subject
Surface physics
en
dc.subject
Scanning Probe Microscopy
en
dc.subject
polar oxide surfaces
en
dc.title
Polarity compensation on KTaO3(001) surfaces
en
dc.title.alternative
Polaritätskompensationen der KTaO3(001) Oberfläche