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キーワード:
polycrystalline surfaces; surface defects; oxygen; cerium
要旨:
Oxygen nonstoichiometry of nanocrystalline ceria powder with a particle
size of about 12 nm was measured by thermogravimetric techniques as a
function of temperature, oxygen partial pressure and synthetic route.
The measured oxygen release/uptake from the samples under isothermal or
isobaric conditions applied in this study are found to be predominantly
due to variations in the surface nonstoichiometry. Its oxygen partial
pressure dependence indicates the presence of surface oxygen vacancies
in different ionization states in addition to segregated impurities.
(C) 2003 Published by Elsevier B.V.
