Title
Magnetic and structural studies of the multifunctional material <tex>$SrFe_{0.75}Mo_{0.25}O_{3-\text{\textgreek{d}}}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Easton, Pa ,
Subject
Chemistry
Source (journal)
Inorganic chemistry / American Chemical Society. - Easton, Pa
Volume/pages
51(2012) :22 , p. 12273-12280
ISSN
0020-1669
ISI
000311173700024
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
SrFe0.75Mo0.25O3-delta has been recently discovered as an extremely efficient electrode for intermediate temperature solid oxide fuel cells (IT-SOFCs). We have performed structural and magnetic studies to fully characterize this multifunctional material. We have observed by powder neutron diffraction (PND) and transmission electron microscopy (TEM) that its crystal symmetry is better explained with a tetragonal symmetry (I4/mcm space group) than with the previously reported orthorhombic symmetry (Pnma space group). The temperature dependent magnetic properties indicate an exceptionally high magnetic ordering temperature (T-N similar to 750 K), well above room temperature. The ordered magnetic structure at low temperature was determined by PND to be an antiferromagnetic coupling of the Fe cations. Mossbauer spectroscopy corroborated the PND results. A detailed study, with X-ray absorption spectroscopy (XAS), in agreement with the Mossbauer results, confirmed the formal oxidation states of the cations to be mixed valence Fe3+/4+ and Mo6+.
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