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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.

Volltext §
DOI: 10.5445/IR/1000071933
Cover der Publikation
Zugehörige Institution(en) am KIT Laboratorium für Elektronenmikroskopie (LEM)
Publikationstyp Hochschulschrift
Publikationsjahr 2017
Sprache Englisch
Identifikator urn:nbn:de:swb:90-719336
KITopen-ID: 1000071933
Verlag Karlsruher Institut für Technologie (KIT)
Umfang II, 176 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Physik (PHYSIK)
Institut Laboratorium für Elektronenmikroskopie (LEM)
Prüfungsdatum 11.11.2016
Projektinformation DFG, DFG EIN, GE 841/24-1
Schlagwörter 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)
Referent/Betreuer Gerthsen, D.
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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