Phase stability and electric conductivity of Er2O3-Nb2O5 co-doped Bi2O3 electrolyte

被引：50

作者：

Chou, Tung ^{[1
]}

Liu, Li-Der ^{[1
]}

Wei, Wen-Cheng J. ^{[1
]}

机构：

[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Taipei, Taiwan

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2011年 / 31卷 / 16期

关键词：

Ionic conductivity; Fuel cells; Defect; Electron microscopy; Bi2O3; OXIDE-ION CONDUCTION; SINTERED OXIDES; TRANSFORMATION; DELTA-BI2O3; KINETICS;

D O I：

10.1016/j.jeurceramsoc.2011.04.016

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：3087 / 3094

页数：8

共 29 条

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