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A Comparative Study of the Performance of SrCo 0.76 Fe 0.19 Al 0.1 O x and ( SrCo 0.8 Fe 0.2 O 3−δ ) 0.95 ( SrAl 2 O 4 ) 0.05 Mixed‐Conducting Membranes
Author(s) -
Zhu Na,
Zhang Guangru,
Liu Zhengkun,
Dong Xueliang,
Jin Wanqin,
Liu Shaomin
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12248
Subject(s) - oxygen , orthorhombic crystal system , brownmillerite , oxygen permeability , oxygen transport , perovskite (structure) , materials science , chemistry , analytical chemistry (journal) , mineralogy , chemical engineering , crystal structure , crystallography , chromatography , organic chemistry , engineering
Dense oxygen permeable ceramic membranes are promising materials for separating oxygen from air and for syngas production. The crystal structure, oxygen vacancy, microstructure, thermal expansion behavior, electrical conductivity, and oxygen permeability of two mixed‐conducting ceramics: 5 mol% SrAl 2 O 4 ‐doped SrCo 0.8 Fe 0.2 O 3 − δ ( SCF ‐ SA ) and SrCo 0.76 Fe 0.19 Al 0.1 O x ( SCFA ), with the same overall cation composition, were systematically investigated in this work. The main phases of SCFA and SCF ‐ SA are cubic perovskite and no orthorhombic brownmillerite appears from 700°C to 900°C in air, while SCF ‐ SA presents minor unidentified phases. SCF ‐ SA shows lower electrical conductivity than SCFA . SCFA membranes exhibit lower oxygen permeation flux than SCF ‐ SA . At 850°C, the oxygen permeation fluxes of SCFA and SCF ‐ SA are 1.23 and 1.46 mL/cm 2 /min, respectively, under the oxygen partial pressure gradient of 0.21 × 10 5 /1 × 10 2 Pa.