Two-dimensional manganese oxide nanolayers on Pd(100): the surface phase diagram

Abstract

Abstract:Two-dimensional manganese oxide layers have been grown on Pd(100) and have been characterized is speculated that they mediate the epitaxial growth of MnO on Pd(100) by providing structurally graded interfaces.

Structural and vibrational properties of two-dimensionalMnxOylayers on Pd(100): Experiments and density functional theory calculations

“…This PO procedure has been preferred over the reactive evaporation ͑RE͒ procedure involving deposition of Mn in oxygen atmosphere, because it typically provides films with smoother morphology and containing a single dominant phase, as judged by STM and LEED. 19 The Mn deposition rate was monitored by a quartz crystal microbalance, and evaporation rates of 0.5 ML min −1 or less were usually employed, with 1 ML containing 1.32 ϫ 10 15 Mn atoms/ cm 2 as referred to the Pd͑100͒ surface atom density. O 2 pressures in the range 1 ϫ 10 −7 -5 ϫ 10 −6 mbar ͑Ref.…”

“…Below 1 ML, a complex phase diagram of Mn oxides on Pd͑100͒ is observed 19 composed of nine different interfacestabilized phases. The experimental phase stability diagram as a function of the oxygen pressure P͑O 2 ͒ and of the O chemical potential O is depicted schematically in Fig.…”

An HREELS investigation of MnO /Rh(100) model catalyst

“…In particular, manganese oxide thin films have been successfully grown on a variety of metallic substrates, like Rh(111) [14], Pt(111) [15], Ag(100) [16] and Pd(100) [17,18].…”

Incommensurate Moiré overlayer with strong local binding: CoO(111) bilayer on Ir(100)

“…Candidates are rock-salt type FeO, MnO, and CoO films of (111) orientation, for which films of ultimate thinness -single hexagonal metal-oxygen bilayers -have been found on a number of metal substrates. [11][12][13][14][15][16][17][18][19][20] In these cases high-order commensurate phases were reported with unit cell dimensions of about ten times that of the substrate, corresponding to about 10% lattice misfits between substrates and oxide films. In the case of (100) oriented substrates, this just leads to close correspondence of row distances in one direction and, by a slight uniaxial distortion, the films achieve one-dimensional commensurability (row-on-row matching).…”