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Title: Synthesis and characterization of brownmillerite SrFeO{sub 2.5} in nanostructured form

Synthesis of bulk polycrystalline and nanocrystalline oxygen-deficient SrFeO{sub 2.5} compounds, with potential applications as oxygen membranes, has been explored by chemical route to optimize an easy and reproducible method for high yield. The structure of the samples was investigated by X-ray powder diffraction followed by structural refinement. Both bulk and nanocrystalline SrFeO{sub 2.5} crystallize in Imma space group. X-ray powder diffraction pattern corresponds to the brownmillerite structure in which the Fe cations exist in an octahedral or tetrahedral configuration in alternate layers along the b axis. Brunauer−Emmett−Teller (BET) surface area is found to be 0.40m{sup 2}/g and 14 m{sup 2}/g for bulk and nanocrystalline SrFeO{sub 2.5} respectively. The morphology of these materials was also investigated by scanning electron microscopy and transmission electron microscopy.
Authors:
; ;  [1]
  1. Crystal Growth Centre, Anna University, Chennai-600 025 (India)
Publication Date:
OSTI Identifier:
22490221
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1665; Journal Issue: 1; Conference: 59. DAE solid state physics symposium 2014, Tamilnadu (India), 16-20 Dec 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CATIONS; FERRITES; ION MICROPROBE ANALYSIS; MEMBRANES; MORPHOLOGY; NANOSTRUCTURES; OXYGEN; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY; STRONTIUM COMPOUNDS; SURFACE AREA; SYNTHESIS; TETRAGONAL LATTICES; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION