期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 31, 期 16, 页码 3087-3094出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2011.04.016
关键词
Ionic conductivity; Fuel cells; Defect; Electron microscopy; Bi2O3
Two oxides, Er2O3 and Nb2O3, are used to stabilize delta-phase Bi2O3 used as electrolyte of solid oxide fuel cell. Optimization of dopant ratio and total doping concentration (TDC) is determined by X-ray diffraction, and successfully reduce the TDC (Er + Nb) to 10-15 mol.%. Conductivities of different compositions are measured by two-probe method. The results show that highest conductivity appears at the minimum doping concentrations. Phase stability of ENSB samples with Er/Nb ratio of 2/1 and TDC of 10-20 mol.% at 650 degrees C up to 300 h is analyzed showing two newly formed (alpha- and gamma-) phases in the samples. Degradation of conductivity at 650 C is studied in detail by DTA and TEM. The abnormity of lattice contraction of delta-phase is discussed. (C) 2011 Elsevier Ltd. All rights reserved.
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