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

Author(s)

Fanghua Li, Georg Parteder, Francesco Allegretti, Cesare Franchini, Raimund Podloucky, Svetlozar L. Surnev, Falko P. Netzer

Abstract

Two-dimensional manganese oxide layers have been grown on Pd(100) and

have been characterized by means of scanning tunnelling microscopy, low

energy electron diffraction and x-ray photoelectron spectroscopy (XPS).

The complex surface phase diagram of MnO_x on Pd(100)

is reported, where nine different novel Mn oxide phases have been

detected as a function of the chemical potential of oxygen μ_O.

Three regions of the chemical potential of oxygen can be identified, in

which structurally related oxide phases are formed, often in

coexistence at the surface. The different regions of μ_O are

reflected in the oxidation states of the respective Mn oxide nanolayers

as revealed by the Mn 2p and O 1s XPS binding energies. The MnO_x

nanolayers form two-dimensional wetting layers and it is speculated

that they mediate the epitaxial growth of MnO on Pd(100) by providing

structurally graded interfaces.

Organisation(s)

Computational Materials Physics, Department of Physical Chemistry

External organisation(s)

Karl-Franzens-Universität Graz

Journal

Journal of Physics: Condensed Matter

Volume

No. of pages

ISSN

0953-8984

DOI

https://doi.org/10.1088/0953-8984/21/13/134008

Publication date

2009

Peer reviewed

Yes

Austrian Fields of Science 2012

104017 Physical chemistry, 104011 Materials chemistry

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