An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals
The formation of their onoxyhydroxide schwertmannite has been monitored by time-resolved transmission electronmicroscopy (TEM) studies. Schwertmannitea ggregates are found to form initially as spherical agglomerates offer rihydrite crystallites, which then begin to grow characteristic needles on th...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Elsevier Science BV
2009
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| Online Access: | http://hdl.handle.net/20.500.11937/47300 |
| _version_ | 1848757796091199488 |
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| author | Hockridge, James Jones, Franca Loan, M. Richmond, William |
| author_facet | Hockridge, James Jones, Franca Loan, M. Richmond, William |
| author_sort | Hockridge, James |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The formation of their onoxyhydroxide schwertmannite has been monitored by time-resolved transmission electronmicroscopy (TEM) studies. Schwertmannitea ggregates are found to form initially as spherical agglomerates offer rihydrite crystallites, which then begin to grow characteristic needles on their surfaces. High-resolution images of the needles show that they are initially comprised of aligned goethite nanocrystals, which subsequently coarsen to form crystallographically coherent needles of goethite. Thus, needle formation on schwertmannite aggregates can be considered as the first stage in the phase transformation from schwertmannite to goethite. The results of this study suggest that schwertmannite is not a distinct mineral phase, but may be a mixture of ferrihydrite and poorly crystalline goethite with a distinctive morphology directed by the presence of surface-adsorbed sulfate anions. |
| first_indexed | 2025-11-14T09:33:47Z |
| format | Journal Article |
| id | curtin-20.500.11937-47300 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:33:47Z |
| publishDate | 2009 |
| publisher | Elsevier Science BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-473002017-09-13T16:01:26Z An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals Hockridge, James Jones, Franca Loan, M. Richmond, William Iron oxides Oriented aggregation Characterisation Crystal morphology The formation of their onoxyhydroxide schwertmannite has been monitored by time-resolved transmission electronmicroscopy (TEM) studies. Schwertmannitea ggregates are found to form initially as spherical agglomerates offer rihydrite crystallites, which then begin to grow characteristic needles on their surfaces. High-resolution images of the needles show that they are initially comprised of aligned goethite nanocrystals, which subsequently coarsen to form crystallographically coherent needles of goethite. Thus, needle formation on schwertmannite aggregates can be considered as the first stage in the phase transformation from schwertmannite to goethite. The results of this study suggest that schwertmannite is not a distinct mineral phase, but may be a mixture of ferrihydrite and poorly crystalline goethite with a distinctive morphology directed by the presence of surface-adsorbed sulfate anions. 2009 Journal Article http://hdl.handle.net/20.500.11937/47300 10.1016/j.jcrysgro.2009.06.023 Elsevier Science BV fulltext |
| spellingShingle | Iron oxides Oriented aggregation Characterisation Crystal morphology Hockridge, James Jones, Franca Loan, M. Richmond, William An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals |
| title | An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals |
| title_full | An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals |
| title_fullStr | An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals |
| title_full_unstemmed | An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals |
| title_short | An electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals |
| title_sort | electron microscopy study of the crystal growth of schwertmannite needles through oriented aggregation of goethite nanocrystals |
| topic | Iron oxides Oriented aggregation Characterisation Crystal morphology |
| url | http://hdl.handle.net/20.500.11937/47300 |