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

Details Two-dimensional manganese oxide nanolayers on Pd(100): Surface phase diagram Two-dimensional manganese oxide nanolayers on Pd(100): Surface phase diagram

2008-11-27

arxiv.org/abs/0811.4555v1

J. Phys.: Condens. Matter 21 (13), 134008 (2009)

Physics

Condensed Matter

Materials Science

24 pages, 12 figures

Scientific paper

10.1088/0953-8984/21/13/134008

Two-dimensional manganese oxide layers have been grown on Pd(100) and have been characterized by scanning tunnelling microscopy (STM), low-energy electron diffraction (LEED) and X-ray photoelectron spectroscopy (XPS). The complex surface phase diagram of MnOx on Pd(100) is reported, where nine different novel Mn oxide phases have been detected as a function of the chemical potential of oxygen mO. 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 mO 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 MnOx 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.

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