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Formation of Goethite and Hematite from Neodymium-Containing Ferrihydrite Suspensions

Published online by Cambridge University Press:  28 February 2024

Tetsushi Nagano ,
Hisayoshi Mitamura ,
Shinichi Nakayama  and
Satoru Nakashima
Tetsushi Nagano*
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan
Hisayoshi Mitamura*
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan
Shinichi Nakayama*
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan
Satoru Nakashima*
Affiliation:
Department of Earth and Planetary Materials Science, Graduate School of Science, Hokkaido University, N10 W8, Sapporo 060-0810, Japan
*
†Present address: Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan.
†Present address: Department of Environmental Sciences, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan.
‡Present address: Department of Fuel Cycle Safety Research, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319-1195, Japan.
§Present address: Interactive Research Center for Science Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152-8551, Japan
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Abstract

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The effects of neodymium (Nd) on the transformation of ferrihydrite to iron oxides was studied. The possible isomorphous substitution of Nd3+ for Fe3+ in iron oxides was examined also. Nd was used as an inactive substitute of trivalent radioactive actinide elements. Hydrolysis of ferric nitrate solution containing 0–30 mole % of Nd formed Nd, Fe-rich ferrihydrite as initial precipitates, which were poorly crystalline. Aging of the Nd-containing ferrihydrite in 0.3 M OH− at 40°C and at pH 9.2 at 70°C formed Nd-free goethite and Nd-substituted hematite. The abundance of these crystalline phases was related to Nd in the parent solutions. Phase abundance, unit-cell parameters, and peak width were estimated by use of the Rietveld method.

Keywords

FerrihydriteGoethiteHematiteNeodymiumPowder X-ray DiffractometryRietveld RefinementTransmission Electron Microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 6 , December 1999 , pp. 748 - 754
Copyright
Copyright © 1999, The Clay Minerals Society

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