Please use this identifier to cite or link to this item:
https://hdl.handle.net/10316/10571
DC Field | Value | Language |
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dc.contributor.author | Kharton, Vladislav V. | - |
dc.contributor.author | Kovalevsky, Andrei V. | - |
dc.contributor.author | Patrakeev, Mikhail V. | - |
dc.contributor.author | Tsipis, Ekaterina V. | - |
dc.contributor.author | Viskup, Alexandre P. | - |
dc.contributor.author | Kolotygin, Vladislav A. | - |
dc.contributor.author | Yaremchenko, Aleksey A. | - |
dc.contributor.author | Shaula, Aliaksandr L. | - |
dc.contributor.author | Kiselev, Evgeny A. | - |
dc.contributor.author | Waerenborgh, João C. | - |
dc.date.accessioned | 2009-07-08T13:59:06Z | - |
dc.date.available | 2009-07-08T13:59:06Z | - |
dc.date.issued | 2008-10-28 | - |
dc.identifier.citation | Chemistry of Materials. 20:20 (2008) 6457-6467 | en_US |
dc.identifier.issn | 0897-4756 | - |
dc.identifier.uri | https://hdl.handle.net/10316/10571 | - |
dc.description.abstract | Increasing the difference of the Ln3+ and A2+ cation radii in perovskite-type Ln0.5A0.5FeO3−δ (Ln = La, Pr, Nd, Sm; A = Sr, Ba) results in higher oxygen deficiency and lower oxygen-ionic and p-type electronic conductivities, determined using the oxygen permeation and total conductivity measurements at 973−1223 K. The relationships between the anion transport and A-site cation size mismatch remain essentially similar in air and under reducing conditions when most iron cations become trivalent, thus confirming critical influence of oxygen-vacancy trapping processes induced by the lattice strain. At low temperatures, analogous correlation is also observed for quadrupole splittings derived from the Mssbauer spectra of oxygen-stoichiometric Ln0.5A0.5FeO3. Contrary to the ionic conductivity variations, the role of surface exchange kinetics as a permeation-limiting factor, evaluated from the membrane thickness dependence of oxygen fluxes, tends to decrease on Ba2+ doping and on decreasing Ln3+ size in Ln0.5Sr0.5FeO3−δ series. The n-type electronic conduction and low-p(O2) stability at 1223 K are substantially unaffected by the cation radius mismatch. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | American Chemical Society | en_US |
dc.rights | openAccess | eng |
dc.title | Oxygen Nonstoichiometry, Mixed Conductivity, and Mössbauer Spectra of Ln0.5A0.5FeO3−δ (Ln = La−Sm, A = Sr, Ba): Effects of Cation Size | en_US |
dc.type | article | en_US |
dc.identifier.doi | 10.1021/cm801569j | - |
item.fulltext | Com Texto completo | - |
item.grantfulltext | open | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.openairetype | article | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
Appears in Collections: | FCTUC Eng.Mecânica - Artigos em Revistas Internacionais |
Files in This Item:
File | Description | Size | Format | |
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Oxygen Nonstoichiometry, Mixed Conductivity, and Mössbauer.pdf | 580.48 kB | Adobe PDF | View/Open |
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