Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation
Cobalt-free perovskite-type oxides with the nominal composition of BaNbyFe1−yO3−δ (y=0.025–0.20) are synthesized and evaluated as materials used in ceramic membranes for oxygen separation. The effects of Nb-doping on the crystal structure, surface morphology, electrical conductivity, chemical bulk d...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
| Published: |
Elsevier BV
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/41127 |
| _version_ | 1848756058780073984 |
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| author | Xu, D. Dong, F. Chen, Y. Zhao, B. Liu, Shaomin Tade, Moses Shao, Zongping |
| author_facet | Xu, D. Dong, F. Chen, Y. Zhao, B. Liu, Shaomin Tade, Moses Shao, Zongping |
| author_sort | Xu, D. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Cobalt-free perovskite-type oxides with the nominal composition of BaNbyFe1−yO3−δ (y=0.025–0.20) are synthesized and evaluated as materials used in ceramic membranes for oxygen separation. The effects of Nb-doping on the crystal structure, surface morphology, electrical conductivity, chemical bulk diffusion and surface exchange, and oxygen permeability of the oxides are systematically investigated using XRD, SEM, four-probe DC conductivity, electrical conductivity relaxation technique, and oxygen permeation studies. A small amount of Nb-doping induces a sharp increase in electrical conductivity. A further increase in the Nb-doping amount, however, lowers the electrical conductivity as a result of the blocking effect of Nb5+ on electronic conduction. A small amount of Nb-doping has less impact on the sintering capability. From the oxygen permeation test, it was found that Nb-doping could significantly enhance the oxygen permeability, especially below 750 °C. Among all of the compositions, BaNb0.05Fe0.95O3−δ shows the highest oxygen permeation fluxes, reaching 1.35 and 0.61 mL cm−2 min−1 for a membrane with a thickness of 1.0 mm at 900 and 700 °C, respectively. Furthermore, the membrane is rate-controlled mainly by bulk diffusion, indicating the potential to further improve the oxygen permeation flux via a thinner membrane. |
| first_indexed | 2025-11-14T09:06:10Z |
| format | Journal Article |
| id | curtin-20.500.11937-41127 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:06:10Z |
| publishDate | 2014 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-411272017-09-13T15:58:41Z Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation Xu, D. Dong, F. Chen, Y. Zhao, B. Liu, Shaomin Tade, Moses Shao, Zongping Cobalt-free perovskite-type oxides with the nominal composition of BaNbyFe1−yO3−δ (y=0.025–0.20) are synthesized and evaluated as materials used in ceramic membranes for oxygen separation. The effects of Nb-doping on the crystal structure, surface morphology, electrical conductivity, chemical bulk diffusion and surface exchange, and oxygen permeability of the oxides are systematically investigated using XRD, SEM, four-probe DC conductivity, electrical conductivity relaxation technique, and oxygen permeation studies. A small amount of Nb-doping induces a sharp increase in electrical conductivity. A further increase in the Nb-doping amount, however, lowers the electrical conductivity as a result of the blocking effect of Nb5+ on electronic conduction. A small amount of Nb-doping has less impact on the sintering capability. From the oxygen permeation test, it was found that Nb-doping could significantly enhance the oxygen permeability, especially below 750 °C. Among all of the compositions, BaNb0.05Fe0.95O3−δ shows the highest oxygen permeation fluxes, reaching 1.35 and 0.61 mL cm−2 min−1 for a membrane with a thickness of 1.0 mm at 900 and 700 °C, respectively. Furthermore, the membrane is rate-controlled mainly by bulk diffusion, indicating the potential to further improve the oxygen permeation flux via a thinner membrane. 2014 Journal Article http://hdl.handle.net/20.500.11937/41127 10.1016/j.memsci.2013.12.030 Elsevier BV restricted |
| spellingShingle | Xu, D. Dong, F. Chen, Y. Zhao, B. Liu, Shaomin Tade, Moses Shao, Zongping Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation |
| title | Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation |
| title_full | Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation |
| title_fullStr | Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation |
| title_full_unstemmed | Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation |
| title_short | Cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation |
| title_sort | cobalt-free niobium-doped barium ferrite as potential materials of dense ceramic membranes for oxygen separation |
| url | http://hdl.handle.net/20.500.11937/41127 |