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Title:
Autocatalytic Oxidation of Lead Crystallite Surfaces
Authors:
Thürmer, Konrad; Williams, Ellen; Reutt-Robey, Janice
Affiliation:
AA(Department of Physics,), AB(Department of Physics,), AC(Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA.)
Publication:
Science, Volume 297, Issue 5589, pp. 2033-2035 (2002). (Sci Homepage)
Publication Date:
09/2002
Category:
CHEMISTRY
Origin:
SCIENCE
DOI:
10.1126/science.297.5589.2033
Bibliographic Code:
2002Sci...297.2033T

Abstract

Growth of an ultrathin lead oxide layer causes massive changes in the shape of lead crystallites. The dynamics of this process was investigated with time-lapsed scanning tunneling microscopy. Pure lead crystallites proved extremely resistant to oxidation. Once nucleated by surface impurities, monolayer films of lead oxide grew readily on lead (111) microfacets in an autocatalytic process. The anisotropic growth of orthorhombic lead oxide films (massicot structure) was most rapid along the direction of weakest lead-oxygen bonding, which suggests that the growth edge autocatalyzes oxygen dissociation by providing proximal sites for oxygen dissociation and attachment.
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Database: Astronomy
Physics
arXiv e-prints