J Mater Sci Technol ›› 2012, Vol. 28 ›› Issue (2): 177-183.

• Regular Papers • Previous Articles     Next Articles

Structure Stability and Oxygen Permeability of Perovskite-type Oxides of Ba0.5Sr0.5Co0.8Fe0.1R0.1O3-δ (R=Al, Mn, Fe, Ce, Cr, Ni, Co)

Ensieh Ganji Babakhani1), Jafar Towfighi2), Laleh Shirazi1), Ali Nakhaeipour1), Akbar Zamaniyan1), Zahra Shafiei1)   

  1. 1) Gas Department, Research Institute of Petroleum Industry (RIPI), 14665-137, Tehran, Iran
    2) Chemical Engineering Department, Engineering Faculty, University of Tarbiat Modares, 14115-111, Tehran, Iran
  • Received:2011-04-12 Revised:2011-10-08 Online:2012-02-28 Published:2012-02-24
  • Contact: Ensieh Ganji Babakhani

Abstract: Perovskite-type Ba0.5Sr0.5Co0.8Fe0.1R0.1O3-δ (R=Al, Mn, Fe, Ce, Cr, Ni, Co) oxide membranes were exploited and synthesized. Oxygen behavior, orderisorder transition and phase stability of these composite oxides were investigated by combined analysis of X-ray diffraction (XRD), temperature programmed desorption (TPD), thermogravimetric-differential thermal analysis (TG-DTA). Oxygen permeation through these membranes was studied by the gas chromatography (GC) method using a high-temperature permeation cell in a wide temperature range from 700 to 950 °C. High permeation fluxes were observed for these materials. The high permeation flux was about 3.19 ml?min-1?cm-2 under air/He gradients at 950 °C, which was achieved
for Ba0.5Sr0.5Co0.8Fe0.1O3-δ (BSCFNiO) membrane. The results of analysis showed no phase transition for BSCFNiO oxide with increasing temperature and XRD pattern of this material after O2-TPD indicated to sustain a pure perovskite structure after oxygen permeation process.

Key words: Perovskite, Ceramic membrane, Oxygen separation, Phase stability