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Titel: Antiphase domain boundary formation in 2D Ba–Ti–O on Pd(111) : an alternative to phase separation
Autor(en): Wührl, Friederike Elisa
Krahn, Oliver
Schenk, Sebastian
Förster, Stefan
Widdra, Wolf
Erscheinungsdatum: 2022
Art: Artikel
Sprache: Englisch
Zusammenfassung: 2D oxide quasicrystals (OQCs) are unique structures arising from atoms positioned at the vertices of a dodecagonal triangle–square–rhombus tiling. The prototypical example for OQCs is derived from BaTiO3 on Pt(111). Herein, scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) investigations of 2D oxide layers derived from BaTiO3 on Pd(111) are reported. Upon ultrahigh vacuum (UHV) annealing, different long-range ordered structures are observed with a base of four vertex atoms forming two edge-sharing equilateral triangles. By a periodic repetition of this base in either quadratic or rectangular unit cells, a triangle–square tiling (known as σ-phase approximant or 32.4.3.4 Archimedean tiling) or a triangle–rhombus tiling is formed. Both structures vary strongly in their vertex density. In addition, the formation of antiphase domain boundaries in the σ phase is observed resulting in a well-ordered incorporation of rhombuses in the triangle–square tiling. A systematic variation of the frequency of these domain boundaries is identified as a mechanism for an incremental increase in the global vertex density, mediating between pure triangle–square and triangle–square–rhombus tilings.
URI: https://opendata.uni-halle.de//handle/1981185920/75397
http://dx.doi.org/10.25673/73445
Open-Access: Open-Access-Publikation
Nutzungslizenz: (CC BY 4.0) Creative Commons Namensnennung 4.0 International(CC BY 4.0) Creative Commons Namensnennung 4.0 International
Sponsor/Geldgeber: Publikationsfonds MLU
Journal Titel: Physica status solidi / B
Verlag: Wiley-VCH
Verlagsort: Weinheim
Band: 259
Heft: 1
Originalveröffentlichung: 10.1002/pssb.202100389
Enthalten in den Sammlungen:Open Access Publikationen der MLU