ORCID Profile
0000-0002-1458-484X
Current Organisation
Institute of Solid State Physics, Russian Academy of Sciences
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Elsevier BV
Date: 26-07-2010
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 09-2013
Publisher: The Electrochemical Society
Date: 2008
DOI: 10.1149/1.2823458
Publisher: Elsevier BV
Date: 09-2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C1DT11212K
Abstract: Mössbauer spectroscopy and magnetization studies of YBaCo(4-x)Fe(x)O(7+δ) (x = 0-0.8) oxidized at 0.21 and 100 atm O(2), indicate an increasing role of penta-coordinated Co(3+) states when the oxygen content approaches 8-8.5 atoms per formula unit. Strong magnetic correlations are observed in YBaCo(4-x)Fe(x)O(8.5) from 2 K up to 55-70 K, whilst the average magnetic moment of Co(3+) is lower than that for δ ≤ 0.2, in correlation with the lower (57)Fe(3+) isomer shifts determined from Mössbauer spectra. The hypothesis on dominant five-fold coordination of cobalt cations was validated by molecular dynamics modeling of YBaCo(4)O(8.5). The iron solubility limit in YBaCo(4-x)Fe(x)O(7+δ) corresponds to approximately x ≈ 0.7. The oxygen intercalation processes in YBaCo(4)O(7+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 YBaCo(4)O(7+δ) ceramics at 598 K is as high as 0.33%.
Publisher: Elsevier BV
Date: 10-2010
Publisher: Elsevier BV
Date: 03-2009
Publisher: American Chemical Society (ACS)
Date: 21-03-2007
DOI: 10.1021/CM070096X
Location: Russian Federation
No related grants have been discovered for Ekaterina Tsipis.