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dc.contributor.authorTsipis, EVen_AU
dc.contributor.authorWaerenborgh, JCen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorKharton, VVen_AU
dc.identifier.citationTsipis, E. V., Waerenborgh, J. C., Avdeev, M., & Kharton, V. V. (2009). Mossbauer spectroscopy analysis of Fe-57-doped YBaCo4O7+delta: effects of oxygen intercalation. Journal of Solid State Chemistry, 182(3), 640-643. doi:10.1016/j.jssc.2008.12.001en_AU
dc.description.abstractMossbauer 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. © 2008, Elsevier Ltd.en_AU
dc.subjectThermal gravimetric analysisen_AU
dc.subjectMagnetic momentsen_AU
dc.titleMossbauer spectroscopy analysis of Fe-57-doped YBaCo4O7+delta: effects of oxygen intercalationen_AU
dc.typeJournal Articleen_AU
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