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  4. Self-assembly of nanoscale lateral segregation profiles
 
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Self-assembly of nanoscale lateral segregation profiles

Publikationstyp
Journal Article
Date Issued
2016-04-07
Sprache
English
Author(s)
Stania, Roland  
Heckel, Wolfgang  
Kalichava, I.  
Bernard, C.  
Kerscher, T. C.  
Cun, H. Y.  
Willmott, P. R.  
Schönfeld, B.  
Osterwalder, J.  
Müller, Stefan  
Greber, Thomas  
Institut
Kunststoffe und Verbundwerkstoffe M-11  
Keramische Hochleistungswerkstoffe M-9  
TORE-URI
http://hdl.handle.net/11420/5936
Journal
Physical Review B - Condensed Matter and Materials Physics  
Volume
93
Issue
16
Article Number
161402
Citation
Physical Review B 16 (93): 161402 (2016-04-07)
Publisher DOI
10.1103/PhysRevB.93.161402
Scopus ID
2-s2.0-84963729403
The surface segregation profile of an intermetallic compound becomes vertically and laterally modulated upon epitaxial growth of a single-layer hexagonal boron nitride (h-BN) nanomesh. h-BN on PtRh(111) forms an 11-on-10 superhoneycomb, such as that on Rh(111) [Corso, Science 303, 217 (2004)SCIEAS0036-807510.1126/science.1091979], though with a smaller lattice constant of 2.73 nm. X-ray photoelectron diffraction shows that the h-BN layer reduces the Pt enrichment of the first layer by promoting site swapping of about 10 Pt-Rh pairs within the 10×10 unit cell between the first and second layers. This segregation profile is confirmed by density-functional-theory-based cluster-expansion calculations. Generally, a strong modulation of the h-BN bonding strength and a higher affinity to one of the constituents leads to self-assembly of top layer patches underneath the nanomesh pores.
DDC Class
530: Physics
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