Structural, Mössbauer studies and oxygen permeation characteristics of Sr1-xBaxFe1-yLiyO3-ξ (x = 0, 0.5; y = 0 � 0.10) system

Jaiswal, SK and Ranjan, R and Kumar, J (2020) Structural, Mössbauer studies and oxygen permeation characteristics of Sr1-xBaxFe1-yLiyO3-ξ (x = 0, 0.5; y = 0 � 0.10) system. In: Journal of Alloys and Compounds, 844 .

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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 à ± 0.002 à , 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). © 2020 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Alloys and Compounds
Publisher:	Elsevier Ltd
Additional Information:	Copy right for this article belongs to Elsevier Ltd
Keywords:	Perovskite-type cubicFerritesX-ray diffractionM€ossbauer spectroscopyOxygen permeability
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Jan 2021 05:55
Last Modified:	01 Jan 2021 05:55
URI:	http://eprints.iisc.ac.in/id/eprint/65949

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