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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu


IMPACT FACTOR 2018: 2.631

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

Online
ISSN
1945-3027
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Volume 97, Issue 1

Issues

Insights into the crystal and aggregate structure of Fe3+ oxide/silica co-precipitates

Laurence G. Dyer
  • Corresponding author
  • Nanochemistry Research Institute, Department of Chemistry and Parker Centre for Integrated Hydrometallurgy Solutions, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
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/ Karena W. Chapman
  • Nanochemistry Research Institute, Department of Chemistry and Parker Centre for Integrated Hydrometallurgy Solutions, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
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  • De Gruyter OnlineGoogle Scholar
/ Phillip English
  • Nanochemistry Research Institute, Department of Chemistry and Parker Centre for Integrated Hydrometallurgy Solutions, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
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  • De Gruyter OnlineGoogle Scholar
/ Martin Saunders
  • Nanochemistry Research Institute, Department of Chemistry and Parker Centre for Integrated Hydrometallurgy Solutions, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
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  • De Gruyter OnlineGoogle Scholar
/ William R. Richmond
  • Nanochemistry Research Institute, Department of Chemistry and Parker Centre for Integrated Hydrometallurgy Solutions, Curtin University of Technology, GPO Box U1987, Perth, Western Australia 6845, Australia
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  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-04-02 | DOI: https://doi.org/10.2138/am.2011.3874

Abstract

Structural characteristics of Fe3+ oxide/silica co-precipitates were investigated. The association between these materials is relevant to practically all natural aqueous systems due to the prevalence of iron and silicon in the Earth’s crust. Crystallographic information is very difficult to obtain from these precipitates due to the nanocrystalline nature of ferrihydrite and the amorphous structure of precipitated silica. Several previously undetermined key insights were gained into the structure of iron oxide/silica co-precipitates through this examination. The distribution of iron and silicon throughout co-precipitate particles is illustrated along with the influence of their association. Evidence to the governing factor behind differences in apparent crystallinity is also presented. This information culminates in the formulation of a precipitation pathway, displaying the formation of the co-precipitates.

Keywords : Ferrihydrite; silica; co-precipitation; pair distribution function

About the article

Received: 2011-04-19

Accepted: 2011-08-14

Published Online: 2015-04-02

Published in Print: 2012-01-01


Citation Information: American Mineralogist, Volume 97, Issue 1, Pages 63–69, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2011.3874.

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