Iron exsolution phenomena in lanthanum strontium ferrite SOFC anodes

T. Götsch, C. Praty, M. Grünbacher, L. Schlicker, M. F. Bekheet, A. Doran, A. Gurlo, M. Tada, H. Matsui, N. Ishiguro, B. Klötzer, S. Penner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The iron exsolution behavior of lanthanum strontium ferrite under reducing conditions is investigated using multiple ex situ and in situ methods. During heating experiments, an irreversible phase transition in oxygen-deficient environments from the rhombohedral to the cubic polymorph is witnessed in the form of a non-linear shift of the reflexes prior to the exsolution of metallic iron. Since this is not the case in oxidative environments, it leads to the conclusion that oxygen vacancies in the lattice stabilize the cubic phase. Also, the exsolution is shown to exhibit an Avramilike behavior, suggesting a diffusion-limited process, where the transport of iron to the Fe-depleted surface-near region is the slowest step.

Original languageEnglish
Title of host publicationECS Transactions
EditorsT. Kawada, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages1327-1341
Number of pages15
Edition1
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - 2017 May 30
Event15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017 - Hollywood, United States
Duration: 2017 Jul 232017 Jul 28

Publication series

NameECS Transactions
Number1
Volume78
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
CountryUnited States
CityHollywood
Period17/7/2317/7/28

ASJC Scopus subject areas

  • Engineering(all)

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