<div class="csl-bib-body">
<div class="csl-entry">Kugler, D., Conti, A., Hütner, J. I., Rajak, S., Meier, M., Jiang, N., Mittendorfer, F., Schmid, M., Diebold, U., Parkinson, G., & Balajka, J. (2025, March 17). <i>The polar spinel MgAl₂O₄(001) surface is stabilized by an aluminum-rich reconstruction</i> [Presentation]. DPG-Frühjahrstagung/DPG Spring Meeting of the Condensed Matter Section, Regensburg, Germany. http://hdl.handle.net/20.500.12708/213725</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/213725
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dc.description.abstract
The atomic-scale surface structure of spinel oxides is key to understanding their catalytic properties. Magnesium aluminate (MgAl2O4, spinel), which gave this class of materials its name, is a wide-gap insulator and poses considerable challenges for experimental surface structure determination. Noncontact atomic force microscopy (nc-AFM) with a qPlus sensor and a well-defined tip apex allowed us to directly resolve the surface structure with atomic resolution and chemical sensitivity. The MgAl2O4(001) surface adopts a c(2 × 4) reconstruction accompanied by an increase of the Al/Mg ratio, as detected by x-ray photoelectron spectroscopy (XPS). The reconstructed surface is enriched in aluminum and contains ordered pairs of octahedrally coordinated magnesium atoms replacing their tetrahedral bulk sites. This charge redistribution within the reconstructed surface layer stabilizes the otherwise polar MgAl2O4(001) termination. The proposed surface reconstruction is similar to those observed on other spinel oxides, such as Fe3O4(001) and Mn3O4(001), suggesting a universal mechanism for compensating the polarity of spinel (001) surfaces.
en
dc.language.iso
en
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dc.subject
spinel
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dc.subject
oxide
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dc.subject
surface
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dc.subject
reconstruction
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dc.subject
afm
en
dc.title
The polar spinel MgAl₂O₄(001) surface is stabilized by an aluminum-rich reconstruction
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dc.title.alternative
Stabilization of the polar spinel MgAl₂O₄(001) surface by an Al-rich reconstruction
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dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
University of Illinois Chicago, United States of America (the)
