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Effects of B‐site doped elements in the electronic‐conducting perovskite phase on the property of dual‐phase membranes
Author(s) -
Cheng Hongwei,
Xiong Xiaolu,
Zhao Hongbin,
Gu Ziqin,
Lu Xionggang,
Xu Qian,
Yao Weilin
Publication year - 2017
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12669
Subject(s) - materials science , oxygen permeability , perovskite (structure) , membrane , chemical stability , microstructure , ionic bonding , fluorite , oxygen , chemical engineering , phase (matter) , ceramic , crystal structure , doping , inorganic chemistry , composite material , crystallography , metallurgy , ion , chemistry , organic chemistry , biochemistry , optoelectronics , engineering
A series of dense oxygen permeable dual‐phase membranes with a composition of 60 wt% Ce 0.8 Gd 0.2 O 2−δ ‐40 wt% Ba 0.95 La 0.05 Fe 0.9 M 0.10 O 3−δ ( CGO ‐ BLFM 0.10 , M=Fe, Nb, Zr, Zn, Sc, Y) were successfully synthesized and evaluated as potential ceramic membranes for oxy‐fuel combustion. The effects of B‐site doped elements in electronic‐conducting phase ( BLFM 0.10 ) on the crystal structure, microstructure, chemical compatibility, oxygen permeability, as well as chemical stability of CGO ‐ BLFM 0.10 were systematically investigated. All electronic‐conducting phase BLFM 0.10 oxides exhibited a pure cubic perovskite structure and showed good chemical compatibility with ionic‐conducting phase CGO . CGO ‐ BLFS c 0.10 showed the best oxygen permeation stability under a pure CO 2 atmosphere. CO 2 ‐corrosion on the perovskite phase is the main reason for the property deterioration of fluorite‐perovskite‐typed dual‐phase membrane materials. The stability of dual‐phase membrane materials can be effectively enhanced by reducing the basicity of electronic‐conducting phase of perovskite materials.