期刊
THIN SOLID FILMS
卷 589, 期 -, 页码 655-661出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2015.06.037
关键词
X-ray photoemission spectroscopy; Solid oxide fuel cell cathodes; Thin films; Perovskite cathode materials; Lanthanum strontium cobalt ferrite
类别
资金
- NSF [CHE-1213381]
- U.S. Department of Energy [DE-AC02-98CH10886]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1213381] Funding Source: National Science Foundation
The ultra-high vacuum surface preparation of heteroepitaxial lanthanum strontium cobalt ferrite thin films has been studied using soft X-ray photoelectron spectroscopy. Specifically, the effect of annealing the films at low temperatures in low partial pressures of oxygen and argon has been investigated. We find that atmospheric surface carbon contamination of the films can be removed in select anneal temperature regimes in argon, but remains bound to the surface with oxygen annealing at any temperature. Irrespective of the gas used, an insulating phase transition occurs near 300 degrees C due to strontium segregation at the surface. The surface develops more insulating character if annealed with oxygen. Different species are proposed to be responsible for the discrepancy in insulating character. (C) 2015 Elsevier B.V. All rights reserved.
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