Investigation of the stability of microtube membranes based on Ba0.5Sr0.5Co0.8 – xFe0.2MoxO3 – δ oxides

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The present article is devoted to the study of the stability of microtubular membranes based on Ba0.5Sr0.5Co0.8 – xFe0.2MoxO3 – δ oxides obtained by the phase inversion method. The work shows that MT membranes of the composition BSCFMx exhibit long-term stability and resistance to thermal cycling in an air/helium gradient. The maximum oxygen fluxes were achieved using an MT membrane of composition Ba0.5Sr0.5Co0.75Fe0.2Mo0.05O3 – δ (JO2 =7.6 ml*cm-2min-1 at Т=850 oС and pO2.1 = 0.21 atm). In this work, a detailed equilibrium phase diagram for the BSCFM5 oxide has been obtained. The absence of unwanted phase transitions has been demonstrated.

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作者简介

E. Shubnikova

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences

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Email: artimonovalena@yandex.ru
俄罗斯联邦, 630128, Novosibirsk

O. Bragina

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences

Email: artimonovalena@yandex.ru
俄罗斯联邦, 630128, Novosibirsk

A. Nemudry

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences

Email: artimonovalena@yandex.ru
俄罗斯联邦, 630128, Novosibirsk

参考

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2. Fig. 1. a, b, c – SEM images of the cross section of the BSCFM5 MT membrane fabricated using the phase inversion method; d – SEM image of the BSCFM5 MT membrane after testing.

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3. Fig. 2. X-ray diffraction patterns of MT membranes of composition BSCFMx (x = 0; 2, 5, 10%) before (1) and after (2) tests, the double perovskite phase (Ba/Sr)CoMoO6 is designated *.

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4. Fig. 3. Long-term stability studies: dependence of oxygen fluxes through MT BSCFMx membranes on time. Experimental conditions: T = 850 oC; partial pressure on the external (supply) side is 0.21 atm.

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5. Fig. 4. Dependence of oxygen flows of the BSCFM5 membrane on time in heating–cooling cycles in the temperature range of 600–850 °C (a), enlarged fragment of thermal cycling (b). Experimental conditions: partial pressure on the outside 0.21 atm, sample heating rate during cycling 35°/min; total flow rate of the oxygen and nitrogen mixture is 150 ml/min; helium flow 90 ml/min.

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6. Fig. 5. Equilibrium diagram “3-δ – log (pO2) - T” for BSCFM5-oxide. ● – data obtained from thermogravimetric experiments (a). Three-dimensional visualization of the phase diagram “3 – δ – log (pO2) - T” for BSCFM5 (b).

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7. Fig. 6. Dependence of the unit cell parameters of BSCFM5 oxide on the partial pressure of oxygen at T = 850 and 900 °C in the region of the “P1-P2” phase transition.

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