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Oxygen permeation characteristics of sol‐gel derived barium‐substituted strontium ferrite membranes
Author(s) -
Jaiswal Shivendra Kumar,
Kumar Jitendra
Publication year - 2017
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.14632
Subject(s) - barium , permeation , oxygen , conductivity , membrane , perovskite (structure) , strontium , oxide , materials science , electrical resistivity and conductivity , analytical chemistry (journal) , barium oxide , sol gel , oxygen permeability , hexagonal phase , chemical engineering , inorganic chemistry , chemistry , hexagonal crystal system , crystallography , chromatography , metallurgy , nanotechnology , organic chemistry , biochemistry , electrical engineering , engineering
The pervoskite‐type oxides have received attention due to their potential applications in catalysis, solid oxide fuel cells, gas sensors, and gas separable membranes. In view of their importance in oxygen separation from air, Ba x Sr 1− x FeO 3−δ (0≤ x≤ 1.0) samples have been synthesized by sol‐gel process and investigated with regard to phase(s), oxygen permeation, and electrical conductivity. These compounds possess at room temperature, a perovskite‐type cubic, mixture of rhombohedral and hexagonal, and hexagonal phase(s) depending upon the composition 0≤ x ≤0.94, x =0.96‐0.98, and x =1.0, respectively. The barium incorporation causes initially enhancement but decrease in electrical conductivity above x =0.94. Above 800°C, all the compositions exhibit a stable cubic phase. The compacts made in the form of discs serve as stable oxygen permeable membranes displaying flux density ( J O 2 ) of ~2.45‐3.58 mL/cm 2 .min at 1000°C. A good correlation has been demonstrated between the oxygen permeation and the electrical conductivity data. The maximum values of J O 2and conductivity correspond to Ba x Sr 1− x FeO 3−δ ( x =0.94) with a perovskite‐type cubic structure. Hence, this membrane is quite suitable for oxygen separation technology.