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dc.contributor.authorKovalevsky, AVen_AU
dc.contributor.authorKharton, VVen_AU
dc.contributor.authorYaremchenko, AAen_AU
dc.contributor.authorPivak, YVen_AU
dc.contributor.authorTsipis, EVen_AU
dc.contributor.authorYakovlev, SOen_AU
dc.contributor.authorMarkov, AAen_AU
dc.contributor.authorNaumovich, ENen_AU
dc.contributor.authorFrade, JRen_AU
dc.identifier.citationKovalevsky, A. V., Kharton, V. V., Yaremchenko, A. A., Pivak, Y. V., Tsipis, E. V., Yakovlev, S. O., Markov, A. A., Naumovich, E. N., & Frade, J. R. (2007). Oxygen permeability, stability and electrochemical behavior of Pr2NiO4+δ-based materials. Journal of Electroceramics, 18(3-4), 205-218. doi:10.1007/s10832-007-9024-7en_AU
dc.description.abstractThe high-temperature electronic and ionic transport properties, thermal expansion and stability of dense Pr2NiO4+δ Pr2Ni0.9Fe0.1O4+δ ceramics have been appraised in comparison with K2NiF4-type lanthanum nickelate. Under oxidizing conditions, the extensive oxygen uptake at temperatures below 1073-1223 K leads to reversible decomposition of Pr2NiO4-based solid solutions into Ruddlesden-Popper type Pr4Ni3O10 and praseodymium oxide phases. The substitution of nickel with copper decreases the oxygen content and phase transition temperature, whilst the incorporation of iron cations has opposite effects. Both types of doping tend to decrease stability in reducing atmospheres as estimated from the oxygen partial pressure dependencies of total conductivity and Seebeck coefficient. The steady-state oxygen permeability of Pr2NiO4+δ ceramics at 1173-1223 K, limited by both surface-exchange kinetics and bulk ionic conduction, is similar to that of La2NiO4+δ. The phase transformation on cooling results in considerably higher electronic conductivity and oxygen permeation, but is associated also with significant volume changes revealed by dilatometry. At 973-1073 K, porous Pr2Ni0.8Cu0.2O4+δ electrodes deposited onto lanthanum gallate-based solid electrolyte exhibit lower anodic overpotentials compared to Pr2Ni0.8Cu0.2O4+δ, whilst cathodic reduction decreases their performance. © 2007, Springer.en_AU
dc.subjectElectric conductorsen_AU
dc.subjectThermal expansionen_AU
dc.subjectTemperature rangeen_AU
dc.titleOxygen permeability, stability and electrochemical behavior of Pr2NiO4+δ-based materialsen_AU
dc.typeJournal Articleen_AU
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