期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 15, 页码 4874-4881出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.06.045
关键词
Strontium titanate; Thermochemical stability; Syngas; Oxygen transport membrane; Knudsen effusion mass spectrometry
资金
- China Scholarship Council (CSC)
- Ministry of Education and Science of the Russian Federation [4.3232.2017/4.6]
The materials typically used for oxygen transport membranes, Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) and La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) tend to decompose due to their low thermochemical stability under reducing atmosphere. Fe- and Co-doped SrTiO3 (SrTi1-x-yCoxFeyO3-delta, x + y <= 0.35) (STCF) materials showing an oxygen transport comparable to LSCF have great potential for application in ion-transport-devices. In this study, the thermochemical stability of pure perovskite-structured STCF was investigated after annealing in a syngas atmosphere at 600-900 degrees C. The phase composition of the materials after annealing was characterized by means of X-ray diffraction (XRD). The thermodynamic activities of SrO, FeO, and CoO in the STCF materials were evaluated using Knudsen effusion mass spectrometry (KEMS). Co-doped SrTiO3 (STC) materials were not stable after annealing in the syngas atmosphere above 5 mol% Co-substitution. Ruddlesden-Popper-like phases and SrCO3 were detected after annealing at 600 degrees C. In contrast, Fe substitution (STF) showed good stability after annealing in syngas upto 35 mol% substitution.
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