A LEED I–V structural determination of the c(4×2) Ni3O4/Pd(100) monolayer phase: an ordered array of Ni vacancies

Reactions on Inverse Model Catalyst Surfaces: Atomic Views by STM

“…Up to one monolayer coverage (i.e. up to 0.8 MLE) a c(4 · 2) oxide layer is formed, which has been rationalised by LEED I(V) measurements in terms of a surface-stabilised Ni 3 O 4 structure [14]. Under the here used preparation conditions, i.e.…”

“…The c(4 · 2) Ni oxide structure is now fully replaced by the (2 · 1) phase and bare Pd patches. This implies that the Ni atom density in the (2 · 1) structure is higher than in the c(4 · 2) structure, which may be related to the Ni vacancies forming the c(4 · 2) periodicity in the Ni 3 O 4 layer [14].…”

“…Epitaxial nickel oxide films grown on a Pd(100) surface have been investigated recently by X-ray photoelectron diffraction (XPD), STM, LEED I(V) and HREELS measurements [13][14][15]. Up to one monolayer coverage (i.e.…”

Strain relaxation and surface morphology of nickel oxide nanolayers

“…Atomically resolved STM images and LEED have revealed that a wetting monolayer forms with a c(4 · 2) structure, which has been identified by Agnoli et al [9] in a LEED I-V study as a Ni 3 O 4 -type oxide phase. Second and subsequent oxide layers grow as stoichiometric NiO islands on top of the c(4 · 2) monolayer, as indicated by the phonon spectra in HREELS and the STM images.…”

Self-organized chromium oxide monolayers on Fe(001)

“…We recall that a c(4 × 2) superstructure like the one observed here has been reported for a number of rocksalt-type oxides on Pd(001). 19,61,62 In those cases, the occurrence of metal vacancies has been proposed as a mechanism able to compensate the compressive stress due to a large lattice mismatch between the substrate and the overlayer. In the present case, however, the interfacial strain is unlikely to be relevant in inducing cation vacancies.…”