Core-level and valence band photoemission study of La1-xSrxMnO3 perovskite oxide powders synthesized by mechanically and thermally activated solid-state reaction

A. Santoni, G. Speranza, M.R. Mancini, F. Padella, L. Petrucci, S. Casadio

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Abstract

High-resolution core-level and valence band x-ray photoemission spectroscopy measurements were performed on La1-xSrxMnO3 perovskite oxide powders synthesized for applications in solid-oxide fuel cells by high-temperature solid-state reaction (x = 0.3 and 0.19) and by room-temperature mechanical activation of the precursors (x = 0.3). A structure in the valence band at about 1 eV below the Fermi level was clearly observed and assigned to the emission from the Mn 3d-derived eg1↑ states, thereby allowing the extraction of information about correlation effects in this type of material. Both the core-level and valence band spectral features were found to be independent of the choice of synthesis route. This finding indicates that mechanical activation, due to its lower synthesis temperature, can represent a valid alternative method of synthesis allowing a better control of the microstructure.
Original languageEnglish
Pages (from-to)3387 - 3393
Number of pages7
JournalJournal of Physics Condensed Matter
Volume11
Issue number16
DOIs
Publication statusPublished - 26 Apr 1999

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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