Stania, RolandRolandStaniaHeckel, WolfgangWolfgangHeckelKalichava, I.I.KalichavaBernard, C.C.BernardKerscher, T. C.T. C.KerscherCun, H. Y.H. Y.CunWillmott, P. R.P. R.WillmottSchönfeld, B.B.SchönfeldOsterwalder, J.J.OsterwalderMüller, StefanStefanMüllerGreber, T.T.Greber2020-04-282020-04-282016-04-07Physical Review B 16 (93): 161402 (2016-04-07)http://hdl.handle.net/11420/5936The 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.en2469-9950201616Journal Article10.1103/PhysRevB.93.161402Other