TY  - JOUR
AU  - Unger, Lana-Simone
AU  - Niedrig, Christian
AU  - Wagner, Stefan F.
AU  - Menesklou, Wolfgang
AU  - Baumann, Stefan
AU  - Meulenberg, Wilhelm A.
AU  - Ivers-Tiffée, Ellen
TI  - Yttrium doping of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ part I: Influence on oxygen permeation, electrical properties, reductive stability, and lattice parameters
JO  - Journal of the European Ceramic Society
VL  - 38
IS  - 5
SN  - 0955-2219
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2018-01815
SP  - 2378 - 2387
PY  - 2018
AB  - Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) exhibits a very high oxygen permeability in its cubic perovskite phase, making it a promising candidate for high-temperature energy-related applications such as oxygen-transport membranes. It suffers, however, from a pronounced phase instability at application-relevant temperatures below 840 °C which is presumed to result from a valence change of B-site cobalt. In an attempt to stabilize the cubic BSCF phase, monovalent Y3+ was doped in small concentrations (1–10 mol-% yttrium) onto its B-site. The influence of this doping on the physico-chemical properties (electrical conductivity, reductive stability, lattice constant), on the sintering behavior, and on the oxygen permeation of BSCF has been systematically investigated. Despite a slightly adverse effect to permeability (decrease in oxygen permeation by about 20–30%), a doping concentration of 10 mol-% Y is found to completely suppress secondary-phase formation and, hence, stabilize the cubic BSCF system at 800 °C. These findings are extremely promising with regard to a long-term operation of BSCF in atmospheres free of acidic impurity gases.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000426029700015
DO  - DOI:10.1016/j.jeurceramsoc.2017.12.045
UR  - https://juser.fz-juelich.de/record/844396
ER  -