期刊
SOLID STATE IONICS
卷 176, 期 11-12, 页码 1013-1020出版社
ELSEVIER
DOI: 10.1016/j.ssi.2004.09.010
关键词
perovskite; cathode; point electrode; thermal expansion coefficient; conductivity
Pr0.7Sr0.3Fe1-xNxO3-delta (PSFN; x=0.2-0.5) compounds were synthesized and characterized by powder X-ray diffraction (XRD), thermal expansion coefficient (TEC) measurements, electrical conductivity and electrochemical impedance spectroscopy on cone-shaped electrodes on a Ce0.9Gd0.1O1.95 (CGO10) electrolyte. T he main phase of the powders belongs to the orthorhombic crystal system. The conductivities are fairly high, e.g., around 450 scm(-1) at 600 degrees C for the x=0.3 compound. The TEC of the compounds is close to the values of ceria-based electrolytes PSEN showed hysteresis in the temperature dependence of the conductivity, TEC and area-specific polarization resistance R-pol. It is considered that the hysteresis was caused by relatively slow adjustment of the oxygen stoichiometry. The electrochemical La0.6Sr0.4Fe0.8Co0.2O3-delta. (c) 2004 Elsevier B.V. All rights reserved.
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