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000834368 1001_ $$0P:(DE-Juel1)138081$$aLenser, Christian$$b0$$eCorresponding author$$ufzj
000834368 1112_ $$a21st International Conference on Solid State Ionics$$cPadova$$d2017-06-18 - 2017-06-23$$gSSI21$$wItaly
000834368 245__ $$aQuantifying the oxygen stoichiometry of Pr-doped ceria through X-ray diffraction
000834368 260__ $$c2017
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000834368 520__ $$aRecent studies on Pr-doped CeO$_{2}$ (PCO) model electrodes suggest that the fast oxygen surface exchange coefficient and high ionic conductivity of PCO hold the potential for a high performance air electrode material for solid oxide fuel cells (SOFCs).[1] PCO behaves as a mixed ionic-electronic conductor (MIEC) in air at elevated temperature due to the reduction of Pr$^{4+}$ to Pr$^{3+}$ and a concomitant polaronic conductivity σpol. In this study, we characterize the reduction behavior of PCO with different Pr contents in air using high temperature X-ray diffraction (HT-XRD) and compare the results to TGA measurements. Rietveld analysis of the HT-XRD data reveals a temperature-dependent micro-strain in the PCO lattice that we associate with lattice disorder due to the different ionic radii of Pr$^{4+}$ and Pr$^{3+}$. This allows us to identify the precise temperature at which the polaronic conductivity σpol is highest for a given Pr-content. We discuss the effect of the temperature dependence of σpol for air electrodes in the context of conductivity and impedance measurements.1.	Chen, D., S.R. Bishop, and H.L. Tuller, Praseodymium-cerium oxide thin film cathodes: Study of oxygen reduction reaction kinetics. Journal of Electroceramics, 2012. 28(1): p. 62-69.
000834368 536__ $$0G:(DE-HGF)POF3-135$$a135 - Fuel Cells (POF3-135)$$cPOF3-135$$fPOF III$$x0
000834368 536__ $$0G:(DE-Juel1)SOFC-20140602$$aSOFC - Solid Oxide Fuel Cell (SOFC-20140602)$$cSOFC-20140602$$fSOFC$$x1
000834368 7001_ $$0P:(DE-Juel1)130677$$aGunkel, Felix$$b1$$ufzj
000834368 7001_ $$0P:(DE-Juel1)159368$$aSohn, Yoo Jung$$b2$$ufzj
000834368 7001_ $$0P:(DE-Juel1)129636$$aMenzler, Norbert H.$$b3$$ufzj
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