Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5150505 | Solid State Ionics | 2017 | 6 Pages |
Abstract
The effect of Zr-substitution on the evolution of crystal structure, thermal expansion and the electronic transport properties is reported for La1âxSrxCo0.2Fe0.6Zr0.2O3âδ (0.1 â¤Â x â¤Â 1.0) and La1âxSrxCo0.2Mn0.6Zr0.2O3-δ (x = 0.1, 0.2, 0.25, 0.3). La1âxSrxCo0.2Fe0.6Zr0.2O3âδ was found to be single-phase for the compositions investigated. The electrical conductivity of La1âxSrxCo0.2Fe0.6Zr0.2O3âδ demonstrated a maximum for x = 0.5, while the area specific resistance was shown to decrease significantly with increasing Sr-content due to an increased concentration of oxygen vacancies. No signs of oxygen vacancy ordering were observed. The area specific resistance of La0.3Sr0.7Co0.2Fe0.6Zr0.2O3âδ at 600 °C is close to an order of magnitude lower than reported values for La0.4Sr0.6Co0.2Fe0.8O3âδ. The series La1âxSrxCo0.2Mn0.6Zr0.2O3âδ was found as multiphase materials. The stability of both series is discussed with respect to the red-ox properties of the transition metals.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Vegar Ãygarden, Tor Grande,