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Electron microscopy studies of Y-, Sc- and Zr-doped Ba0.5Sr0.5Co0.8Fe0.2O3-δ ceramics for oxygen separation membranes

Meffert, Matthias Simon

Abstract (englisch):
Secondary phase formation poses a major obstacle in the application of the oxygen-conducting perovskite Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) in the intermediate temperature range (700 – 800 °C). Doping with suitable transition metals like Sc, Zr, and Y was investigated to stabilize the cubic BSCF phase. The material was studied by scanning and transmission electron microscopy. This includes the determination of the chemical composition (EDXS), dopant lattice sites (ALCHEMI) and changes of the Co-valence state (EELS). Y-doping was found to strongly reduce secondary phase formation in BSCF.


Zugehörige Institution(en) am KIT Laboratorium für Elektronenmikroskopie (LEM)
Publikationstyp Hochschulschrift
Jahr 2017
Sprache Englisch
Identifikator DOI(KIT): 10.5445/IR/1000071933
URN: urn:nbn:de:swb:90-719336
KITopen ID: 1000071933
Verlag Karlsruhe
Umfang II, 176 S.
Abschlussart Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Laboratorium für Elektronenmikroskopie (LEM)
Prüfungsdatum 11.11.2016
Referent/Betreuer Prof. D. Gerthsen
Projektinformation DFG, DFG EIN, GE 841/24-1
Schlagworte BSCF, Y-doping, Stabilization of the cubic BSCF phase, Transmission electron microscopy (TEM), Atom location by channeling enhanced microanalysis (ALCHEMI), Electron energy loss spectroscopy (EELS), Energy dispersive X-ray spectroscopy (EDXS)
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