Abstract
Perovskite ABO3-ξ cubic oxides have immense application in sensors, pumps, and oxygen permeable ceramic membrane industry. An attempt has been made here to study some sol-gel derived cobalt free Sr1-xBaxFe1-yLiyO3-ξ (x = 0, 0.5; y = 0 – 0.10) compounds from perspectives of oxygen separation from air using X-ray diffraction, Mössbauer spectroscopy, and oxygen permeability measurements. The effect of partial substitution of barium and lithium at strontium and iron sites, respectively has been examined on existing phase, oxidation states of iron, deficiency (ξ), oxygen flux density, membrane stability and possible correlations. The compounds are shown to exhibit (i) a stable cubic structure and lattice parameter (increasing in the range 3.862–3.958 Å ± 0.002 Å, Z = 1, space group Pm3m), (ii) Fe4+ → Fe3+ conversion, (iii) upsurge in anion vacancies, and (iv) enhancement in oxygen permeability (JO2 ∼ 2.45–2.81 ml cm−2.min−1 at 1000 °C) with the intended substitutions. The findings reveal natural correlation among themselves and various properties. The membranes (thickness ∼1 mm) display adequate stability at working elevated temperatures and are suitable for gas separation technology (e.g., obtaining pure oxygen from air).
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