Please use this identifier to cite or link to this item:
https://scholarbank.nus.edu.sg/handle/10635/107137
DC Field | Value | |
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dc.title | Nanocrystalline maghemite (γ-Fe 2O 3) in silica by mechanical activation of precursors | |
dc.contributor.author | Xue, J. | |
dc.contributor.author | Zhou, Z. | |
dc.contributor.author | Wang, J. | |
dc.date.accessioned | 2014-10-29T08:39:57Z | |
dc.date.available | 2014-10-29T08:39:57Z | |
dc.date.issued | 2002-04 | |
dc.identifier.citation | Xue, J.,Zhou, Z.,Wang, J. (2002-04). Nanocrystalline maghemite (γ-Fe 2O 3) in silica by mechanical activation of precursors. Journal of the American Ceramic Society 85 (4) : 807-811. ScholarBank@NUS Repository. | |
dc.identifier.issn | 00027820 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/107137 | |
dc.description.abstract | γ-Fe 2O 3 nanocrystallites dispersed in an amorphous silica matrix have been successfully prepared for the first time by mechanical activation of a chemistry-derived precursor at room temperature. The initial 10 h of mechanical activation triggered the formation of nanocrystallites of Fe 3O 4 in a highly activated matrix. Increasing the mechanical-activation time led to a phase transformation from Fe 3O 4 to γ-Fe 2O 3. The γ-Fe 2O 3 phase was well established after mechanical activation of the precursor for 30 h. Further increasing the mechanical-activation time to 40 h induced the formation of α-Fe 2O 3. The mechanical-activation-grown γ-Fe 2O 3 nanocrystallites were ∼10-12 nm in size and well dispersed in the silica matrix, as observed using TEM. They demonstrated super-paramagnetic behavior at room temperature when measured using a Mössbauer spectrometer and a vibrating sample magnetometer (VSM). In addition, the γ-Fe 2O 3 derived from 30 h of mechanical activation exhibited a value of saturation magnetization as high as 62.6 emu/g. | |
dc.source | Scopus | |
dc.type | Article | |
dc.contributor.department | MATERIALS SCIENCE | |
dc.description.sourcetitle | Journal of the American Ceramic Society | |
dc.description.volume | 85 | |
dc.description.issue | 4 | |
dc.description.page | 807-811 | |
dc.description.coden | JACTA | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Staff Publications |
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