Magnetization, Mössbauer and isothermal dilatometric behavior of oxidized YBa(Co,Fe)4O7+δ

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dc.contributor.authorWaerenborgh, JCen_AU
dc.contributor.authorTsipis, EVen_AU
dc.contributor.authorPereira, LCJen_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorNaumovich, ENen_AU
dc.contributor.authorKharton, VVen_AU
dc.date.accessioned2021-02-04T00:44:39Zen_AU
dc.date.available2021-02-04T00:44:39Zen_AU
dc.date.issued2011-11-08en_AU
dc.date.statistics2021-01-19en_AU
dc.description.abstractMössbauer spectroscopy and magnetization studies of YBaCo4-xFexO7+δ (x = 0–0.8) oxidized at 0.21 and 100 atm O2, indicate an increasing role of penta-coordinated Co3+ states when the oxygen content approaches 8–8.5 atoms per formula unit. Strong magnetic correlations are observed in YBaCo4-xFexO8.5 from 2 K up to 55–70 K, whilst the average magnetic moment of Co3+ is lower than that for δ ≤ 0.2, in correlation with the lower 57Fe3+ isomer shifts determined from Mössbauer spectra. The hypothesis on dominant five-fold coordination of cobalt cations was validated by molecular dynamics modeling of YBaCo4O8.5. The iron solubility limit in YBaCo4-xFexO7+δ corresponds to approximately x ≈ 0.7. The oxygen intercalation processes in YBaCo4O7+δ at 470–700 K, analyzed by X-ray diffraction, thermogravimetry and controlled-atmosphere dilatometry, lead to unusual volume expansion opposing to the cobalt cation radius variations. This behavior is associated with increasing cobalt coordination numbers and with rising local distortions and disorder in the crystal lattice on oxidation, predicted by the computer simulations. When the oxygen partial pressure increases from 4 × 10−5 to 1 atm, the linear strain in YBaCo4O7+δ ceramics at 598 K is as high as 0.33%. © Royal Society of Chemistry 2021en_AU
dc.identifier.citationWaerenborgh, J. C., Tsipis, E. V., Pereira, L. C. J., Avdeev, M., Naumovich, E. N., & Kharton, V. V. (2010). Magnetization, Mössbauer and isothermal dilatometric behavior of oxidized YBa(Co,Fe)4O7+δ. Dalton Transactions, 41(2), 667-678. doi:10.1039/C1DT11212Ken_AU
dc.identifier.issn1477-9234en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleDalton Transactionsen_AU
dc.identifier.pagination667-678en_AU
dc.identifier.urihttps://doi.org/10.1039/C1DT11212Ken_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10309en_AU
dc.identifier.volume41en_AU
dc.language.isoenen_AU
dc.publisherRoyal Society of Chemistryen_AU
dc.subjectMagnetizationen_AU
dc.subjectSpectroscopyen_AU
dc.subjectOxygenen_AU
dc.subjectMagnetic momentsen_AU
dc.subjectCationsen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectIronen_AU
dc.subjectCobalten_AU
dc.subjectThermal gravimetric analysisen_AU
dc.subjectDilatometryen_AU
dc.subjectControlled atmospheresen_AU
dc.subjectCrystal latticesen_AU
dc.subjectOxidationen_AU
dc.subjectCeramicsen_AU
dc.titleMagnetization, Mössbauer and isothermal dilatometric behavior of oxidized YBa(Co,Fe)4O7+δen_AU
dc.typeJournal Articleen_AU
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