Grain size effects on oxygen permeation in submicrometric CaTi0.8Fe0.2O3-δ ceramics obtained by mechanical activation
Ceramic samples of CaTi0*8Fe0*2O3--delta were obtained from mechanically activated mixtures of TiO2, Fe2O3 and CaCO3 sintered at 1150 deg C for 2h. The ceramics are dense with submicrometric grains with sizes in the order of 100--200nm and 400--600nm. X--ray diffraction analysis revealed a single pe...
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| Veröffentlicht in: | Journal of the European Ceramic Society 2005, Vol.25 (12), p.2613-2616 |
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| container_title | Journal of the European Ceramic Society |
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| creator | SHAULA, A. L FUENTES, R. O FIGUEIREDO, F. M KHARTON, V. V MARQUES, F. M. B FRADE, J. R |
| description | Ceramic samples of CaTi0*8Fe0*2O3--delta were obtained from mechanically activated mixtures of TiO2, Fe2O3 and CaCO3 sintered at 1150 deg C for 2h. The ceramics are dense with submicrometric grains with sizes in the order of 100--200nm and 400--600nm. X--ray diffraction analysis revealed a single perovskite phase structure indicating a high level of homogeneity, which was confirmed by transmission electron microscopy. The oxygen permeability through these samples, measured in the range 700--950 deg C, is about 50% lower than for ceramics with considerably larger grains, close to 10mum. The permeability increases linearly with the increase of the grain size in the range from ~200nm to ~10mum. Observations by results suggest that the grain boundaries have a negative impact on the high temperature ionic transport properties of CaTi0*8Fe0*2O3--delta ceramics. |
| doi_str_mv | 10.1016/j.jeurceramsoc.2005.03.112 |
| format | Article |
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L ; FUENTES, R. O ; FIGUEIREDO, F. M ; KHARTON, V. V ; MARQUES, F. M. B ; FRADE, J. R</creator><creatorcontrib>SHAULA, A. L ; FUENTES, R. O ; FIGUEIREDO, F. M ; KHARTON, V. V ; MARQUES, F. M. B ; FRADE, J. R</creatorcontrib><description>Ceramic samples of CaTi0*8Fe0*2O3--delta were obtained from mechanically activated mixtures of TiO2, Fe2O3 and CaCO3 sintered at 1150 deg C for 2h. The ceramics are dense with submicrometric grains with sizes in the order of 100--200nm and 400--600nm. X--ray diffraction analysis revealed a single perovskite phase structure indicating a high level of homogeneity, which was confirmed by transmission electron microscopy. The oxygen permeability through these samples, measured in the range 700--950 deg C, is about 50% lower than for ceramics with considerably larger grains, close to 10mum. The permeability increases linearly with the increase of the grain size in the range from ~200nm to ~10mum. Observations by results suggest that the grain boundaries have a negative impact on the high temperature ionic transport properties of CaTi0*8Fe0*2O3--delta ceramics.</description><identifier>ISSN: 0955-2219</identifier><identifier>EISSN: 1873-619X</identifier><identifier>DOI: 10.1016/j.jeurceramsoc.2005.03.112</identifier><language>eng</language><publisher>Oxford: Elsevier</publisher><subject>Applied sciences ; Building materials. Ceramics. 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The oxygen permeability through these samples, measured in the range 700--950 deg C, is about 50% lower than for ceramics with considerably larger grains, close to 10mum. The permeability increases linearly with the increase of the grain size in the range from ~200nm to ~10mum. Observations by results suggest that the grain boundaries have a negative impact on the high temperature ionic transport properties of CaTi0*8Fe0*2O3--delta ceramics.</description><subject>Applied sciences</subject><subject>Building materials. Ceramics. 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| source | Elsevier ScienceDirect Journals |
| subjects | Applied sciences Building materials. Ceramics. Glasses Ceramic industries Chemical industry and chemicals Chemistry Colloidal state and disperse state Exact sciences and technology General and physical chemistry Membranes Miscellaneous Technical ceramics |
| title | Grain size effects on oxygen permeation in submicrometric CaTi0.8Fe0.2O3-δ ceramics obtained by mechanical activation |
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