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The interaction of water and Mn with surfaces of CaCO 3 : An XPS study
Author(s) -
Baer D. R.,
Blanchard D. L.,
Engelhard M. H.,
Zachara J. M.
Publication year - 1991
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740170108
Subject(s) - calcite , x ray photoelectron spectroscopy , sputtering , chemistry , single crystal , analytical chemistry (journal) , cleavage (geology) , water vapor , inorganic chemistry , mineralogy , materials science , crystallography , chemical engineering , thin film , environmental chemistry , nanotechnology , organic chemistry , fracture (geology) , engineering , composite material
This paper reports an examination of the chemistry of single‐crystal calcite (CaCO 3 ) using x‐ray photoelectron spectroscopy (XPS). This calcite cleavage surface was examined as freshly opened in vacuum and after several different treatments, including exposure to water vapor, covered with different amounts of evaporated Mn, ion sputtered and immersed in pure water. Clean and ion‐sputtered calcite were not observed to react with water vapor. Ion sputtering caused significant changes to both oxygen and calcium bounding at the surface. However immersion of sputtered calcite in water caused removal of the sputter damage and produced an XPS spectrum nearly indistinguishable from that of the fresh cleavage surface. The shapes and positions of the Mn and O peaks in the spectra of CaCO 3 with submonolayer coverages of Mn indicate partial oxiation of the metal as deposited presumably owing to reaction with the calcite surface. Immersion of the Mn‐coated calcite in water caused further changes in the Mn peak, suggesting additional oxidation of the Mn.