Mossbauer spectroscopy analysis of Fe-57-doped YBaCo4O7+delta: Effects of oxygen intercalation
authors Tsipis, EV; Waerenborgh, JC; Avdeev, M; Kharton, VV
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords YBaCo4O7; YBaCo4O8; Kagome lattices; Mossbauer spectroscopy; Fe-57 local probe; Oxygen intercalation; Thermogravimetric analysis
keywords CAPABILITY; ABSORPTION; TRANSPORT
abstract Mossbauer spectroscopy of layered YBaCo3.96Fe0.04O7+delta (delta=0.02 and 0.80), where 1% cobalt is substituted With 57 Fe isotope, revealed no evidence of charge ordering at 4-293 K. The predominant state of iron cations was found trivalent, irrespective of their coordination and oxygen stoichiometry variations determined by thermogravimetric analysis. The extremely slow kinetics of isothermal oxidation at 598 K in air, and the changes of Fe3+ fractions in the alternating triangular and Kagome layers in oxidized YBaCo3.96Fe0.04O7.80, may suggest that oxygen intercalation is accompanied with a substantial structural reconstruction stagnated due to sluggish cation diffusion. Decreasing temperature below 75-80 K leads to gradual freezing of the iron magnetic moments in inverse correlation with the content of extra oxygen. The formation of metal-oxygen octahedra and resultant structural distortions extend the temperature range where the paramagnetic and frozen states co-exist, down to 45-50 K. (C) 2008 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
year published 2009
volume 182
issue 3
beginning page 640
ending page 643
digital object identifier (doi) 10.1016/j.jssc.2008.12.001
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000264302000034
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