Atomic-Scale Determination of Misfit Dislocation Loops at Metal-Metal Interfaces

Jacobsen, Joachim; Nielsen, L.; Besenbacher, Flemming; Stensgaard, I.; Lægsgaard, Erik; Rasmussen, T.; Jacobsen, Karsten; Nørskov, Jens K.

doi:10.1103/physrevlett.75.489

Cited by 163 publications

(144 citation statements)

References 11 publications

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“…If one considers the STM images to be a direct "representation" of the surface crystallographic structure one can imagine that the black part of the triangles is due to the absence of silver atoms. Despite the difficulties to imagine a driving force for this mechanism, this structure can easily be obtained by removing 9 [9]. In this latter study, at low temperature the structure observed is very similar to the theoretical simulation shown in Figure 1b [9].…”

Section: (C) Edp Sciences 1998supporting

confidence: 71%

“…Despite the difficulties to imagine a driving force for this mechanism, this structure can easily be obtained by removing 9 [9]. In this latter study, at low temperature the structure observed is very similar to the theoretical simulation shown in Figure 1b [9]. Further X-ray diffraction analysis (rod scans) and theoretical calculations (ETBQMD) of the different possible structures including surface vacancies are needed to fully understand this complicated structure.…”

Section: (C) Edp Sciences 1998mentioning

confidence: 81%

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An Incommensurate Reconstruction Studied with Scanning Tunnelling Microscopy and Surface X-Ray Diffraction

Aufray

Göthelid

Gay

et al. 1997

Microsc. Microanal. Microstruct.

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Abstract. 2014 We present the first results of a combined scanning tunneling microscopy (STM) and surface X-ray diffraction (SXRD) study of Ag monolayer deposited on Cu(111). The STM images of Ag monolayer show a periodic frame of triangles, 4 or 5 atomic row wide with 1 or 3 atoms protruding in the centre respectively. Away from the triangles, the corrugation of the atomic rows is about 0.05 Å while the depth of the triangles is about 0.5 Å. SXRD shows an "average" Ag surface unit cell (9.43 x 9.43) times the Cu(111) surface unit cell without rotation in good agreement with STM observations.

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Section: (C) Edp Sciences 1998supporting

confidence: 71%

Section: (C) Edp Sciences 1998mentioning

confidence: 81%

An Incommensurate Reconstruction Studied with Scanning Tunnelling Microscopy and Surface X-Ray Diffraction

Aufray

Göthelid

Gay

et al. 1997

Microsc. Microanal. Microstruct.

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“…Therefore also in the 1 ML TN the topmost Ag layer is free of partials, which hence must be buried in the Pt substrate, reminding one of the case of 1 ML Au/Ni(111). 22 An additional feature of the 2 ML Ag TN is that it exhibits an intriguing STM contrast located in the quasihexagons 23 and absent on the SP. Figure 2 shows this contrast with atomic resolution, revealing that 22 ± 2% of the surface atoms appear lower by 0.15Å.…”

mentioning

confidence: 99%

Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

et al. 2012

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The trigonal strain-relief pattern formed by an Ag bilayer on Pt(111) is a prominent example for dislocation networks and their use as nanotemplates. However, its atomic structure has not been solved. Combining scanning tunneling microscopy, low-energy ion scattering, and x-ray photoelectron diffraction, we demonstrate that, unexpectedly, about 22% of the atoms exchange across the Ag/Pt interface, and that the partial dislocations defining the trigonal network are buried in the Pt interface layer. We present an embedded-atom-method simulation identifying the lowest energy structure compatible with all experimental findings. Strain-relief patterns formed by heteroepitaxial films act as templates for the self-assembly of highly ordered nanostructure superlattices. 1 The first system where the growth kinetics has been studied is a superlattice of Ag islands grown on a trigonal network (TN) formed by two monolayers (ML) of Ag/Pt(111). 2,3 The system has been modeled by assuming a network of surface Shockley partial dislocations 4 acting as repulsive line defects and thus confining the deposited Ag adatoms into the (25 × 25) unit cells. 2,3 However, the topmost Ag layer of the TN has recently been shown to be nearly perfectly hexagonal; hence there are no partial dislocations at the surface. 5,6 Nevertheless, the TN exhibits remarkable template functions. Well-ordered sputter holes 5 and adsorbed organic molecules, 6-8 as well as strong spatial variations of the local work function 9 have been reported. A fundamental understanding of any template function evidently requires knowledge of its atomic structure. 10 Despite considerable efforts, a realistic atomistic model has not yet been developed for the 2 ML Ag/Pt(111) TN.Silver on Pt(111) is a system with a particularly rich surface phase diagram. Submonolayers deposited at room temperature (RT) are pseudomorphic for islands smaller than 20 nm, whereas larger islands form surface partial dislocations. 11,12 Counterintuitively, the dislocations disappear at a full monolayer (defined as one Ag atom per Pt substrate atom), where the stress resulting from the misfit is largest. This has been related to the chemical adatom potential and to the presence of an adatom gas. 11 Further growth at RT leads to a striped phase (SP) 4,13 with pairs of partial dislocations. Upon annealing to 800 K the SP transforms into the stable TN structure. 4 Deposition of Ag submonolayers at higher temperature, or their annealing at T > 620 K, leads to a real mixture formed by monolayer Ag clusters embedded into the uppermost atomic substrate layer for a coverage < 0.5 ML and the reverse for 0.5 ML < < 1.0 ML. 14 This mixing has been confirmed by CO titration 15 and He-atom scattering 16 and is confined to the uppermost layer; hence, the name "surface alloy". 17 For 1.0 ML, especially for = 2 ML, Ag and Pt were believed to be phase separated up to the Ag desorption temperature.In this paper we report the surprising observation that the system mixes again for 2 ML Ag in the TN structure. This mi...

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“…Au was deposited from an e-beam evaporator (Oxford Applied Research). The Au evaporation rate was quantitatively calibrated from STM measurements of Au deposited at 300 K on a Ni(111) surface (see, e.g., [9]) to be 0:01 ML= min [where one monolayer (ML) is defined as the packing density of an Au(111) plane, 1:39 10 15 atoms cm ÿ2 ]. As is shown below, Au clusters bind very weakly to the stoichiometric surface.…”

mentioning

confidence: 99%

Bonding of Gold Nanoclusters to Oxygen Vacancies on RutileTiO2(110)

et al. 2003

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Through an interplay between scanning tunneling microscopy (STM) and density functional theory (DFT) calculations, we show that bridging oxygen vacancies are the active nucleation sites for Au clusters on the rutile TiO 2 110 surface. We find that a direct correlation exists between a decrease in density of vacancies and the amount of Au deposited. From the DFT calculations we find that the oxygen vacancy is indeed the strongest Au binding site. We show both experimentally and theoretically that a single oxygen vacancy can bind 3 Au atoms on average. In view of the presented results, a new growth model for the TiO 2 110 system involving vacancy-cluster complex diffusion is presented.

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Atomic-Scale Determination of Misfit Dislocation Loops at Metal-Metal Interfaces

Cited by 163 publications

References 11 publications

An Incommensurate Reconstruction Studied with Scanning Tunnelling Microscopy and Surface X-Ray Diffraction

An Incommensurate Reconstruction Studied with Scanning Tunnelling Microscopy and Surface X-Ray Diffraction

Interface-confined mixing and buried partial dislocations for Ag bilayer on Pt(111)

Bonding of Gold Nanoclusters to Oxygen Vacancies on RutileTiO2(110)

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