期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 172, 期 1, 页码 219-231出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0022-4596(03)00040-9
关键词
lanthanum-strontium ferrite; oxygen conductivity; oxygen ordering; electron conductivity
The conductivity of the entire solid solution La1-xSrxFeO3-delta, where x = 0.2, 0.4, 0.5, 0.7 and 0.9, in the oxygen partial pressure range 10(-19)-0.5 atm, and temperatures between 750degreesC and 950degreesC is reported. The partial contributions from different charge carriers and the energetic parameters governing transport of charged species reveal that the lanthanum-strontium ferrites can be characterized as mixed, ion-electron conductors in the low oxygen pressure/high oxygen deficiency limit. The partial contributions to conductivity from oxygen ions, electrons and holes increase with strontium content and attain maximal values at x = 0.5. Further increase in doping results in development of oxygen vacancy ordering phenomena and deterioration of conducting properties. (C) 2003 Elsevier Science (USA). All rights reserved.
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