authors |
Kharton, VV; Kovalevsk, AV; Patrakeev, MV; Tsipis, EV; Viskup, AP; Kolotygin, VA; Yaremchenko, AA; Shaula, AL; Kiselev, EA; Waerenborgh, JC |
nationality |
International |
journal |
CHEMISTRY OF MATERIALS |
keywords |
PEROVSKITE-TYPE OXIDES; TRANSPORT-PROPERTIES; THERMAL-EXPANSION; FUEL-CELLS; IONIC-CONDUCTIVITY; LANTHANUM FERRITE; CATHODE MATERIALS; SOFC CATHODES; LA1-XSRXFEO3-DELTA; PERMEABILITY |
abstract |
Increasing the difference of the Ln(3+) and A(2+) cation radii in perovskite-type Ln(0.5)A(0.5)FeO(3-delta)) (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 Mossbauer spectra of oxygen-stoichiometric Ln(0.5)A(0.5)FeO(3). 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 Ln(3+) size in Ln(0.5)Sr(0.5)FeO(3-delta) series. The n-type electronic conduction and low-p(O-2) stability at 1223 K are Substantially unaffected by the cation radius mismatch. |
publisher |
AMER CHEMICAL SOC |
issn |
0897-4756 |
year published |
2008 |
volume |
20 |
issue |
20 |
beginning page |
6457 |
ending page |
6467 |
digital object identifier (doi) |
10.1021/cm801569j |
web of science category |
Chemistry, Physical; Materials Science, Multidisciplinary |
subject category |
Chemistry; Materials Science |
unique article identifier |
WOS:000260254400029
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
9.567 |
5 year journal impact factor |
10.102 |
category normalized journal impact factor percentile |
88.386 |
dimensions (citation analysis):
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altmetrics (social interaction):
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