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Interpretation of surface textural changes in SrTiO 3 ex‐oxalate samples using XPS and IR spectroscopies
Author(s) -
Munuera G.,
GonzalezElipe A. R.,
Espinos J. P.,
LopezMolina E.
Publication year - 1990
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.740151109
Subject(s) - x ray photoelectron spectroscopy , microcrystalline , oxalate , crystallite , analytical chemistry (journal) , carbonate , impurity , chemistry , materials science , mineralogy , inorganic chemistry , crystallography , chemical engineering , metallurgy , chromatography , engineering , organic chemistry
Abstract XPS, IR and x‐ray diffraction (XRD) have been used to study high‐surface‐area ‘ex‐oxalate’ polycrystalline SrTiO 3 materials. Changes of surface area and pore size distribution are induced during lixiviation with a 0.1 M HCl solution, which removes carbonate impurities. The study shows the presence in the original sample of a microcrystalline SrCO 3 phase at its surface and isolated CO 3 2−species, these latter remaining even after outgassing at 773 K for 15 h. However, a complete elimination of the SrCO 3 and other carbonate species at the surface is achieved by heating the acid‐lixiviated sample at 773 K, although carbonate species still remain in the bulk of the SrTiO 3 material after this treatment. The usefulness of the combined use of XPS and IR for the characterization of surface and bulk species in this type of powdered material is pointed out during this study.