A case study of the effect of grain size on the oxygen permeation flux of BSCF disk-shaped membrane fabricated by thermoplastic processing

Abstract

Oxygen permeability measurements of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3−ı (BSCF) disk shaped membranes fabricated by thermoplastic processing and sintered at different temperatures (1000-1100• C), showed no influence of the grain size on the oxygen permeation fluxes. To further investigations, Electron Backscattered Diffraction (EBSD) and Conductive mode (CM) microscopy methods were used for texture analysis and observation of the local electrical behavior in the BSCF membranes, respectively. EBSD results revealed that the grain size of the membranes increased with increasing the sintering temperature from an average of 3.32 m at 1000• C to 18.25 m at 1100 • C. Also, it was seen that there was no textural difference between the different samples. CM analysis demonstrated that the electronic conductivity of the grains and grain boundaries was similar in the membrane sintered at 1000• C. Finally, the stability of the membrane under the operation conditions was tested, and it was found that the permeation flux was nearly constant at 900• C after an operation time of more than 50 h, whereas oxygen permeation flux declined after a relative short time at 825• C.

Kinetics of the chrysotile and brucite dehydroxylation reaction: a combined non-isothermal/isothermal thermogravimetric analysis and high-temperature X-ray powder diffraction study

“…In material synthesis, the rate of processes often influences the texture and therefore also the properties of materials (e.g. Cheong et al 2009;Salehi et al 2011).…”

Microstructure and mechanical properties of Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite-structured oxides doped with different contents of Ni

“…Accordingly, it is necessary to investigate microstructural evolution of BSCF, which in return requires a deep understanding of its sintering behaviours. Although there have been considerable researches on the microstructure of BSCF [16][17][18][19][20], there is no literature to report the effect of Ni doping on microstructure of BSCF. To the knowledge of the authors, mechanical properties regarding Ni-doped BSCF have not been also reported yet.…”

Microwave Assisted Synthesis and Sintering of Ba0.5Sr0.5Co0.8Fe0.2O3-δ Perovskite

“…The control of this stage is indispensable to retain a thinner microstructure in dense layer aiming to improve the mechanical properties of these membranes. Regarding the porous layer, the control of grain size aiming to avoid grain growth, results an increase of membrane specific surface 5,8,16,[18][19][20] . The use of microwave energy in ceramic materials sintering has been widely studied over the last decades.…”