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Goethite, a tailor-made host for the critical metal scandium: The FexSc(1-x)OOH solid solution

C. Levard1,

1Aix Marseille Univ., CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France

D. Borschneck1,

1Aix Marseille Univ., CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France

O. Grauby2,

2Aix-Marseille Univ., UMR 7325 CINaM/CNRS, campus de Luminy, 13288 Marseille, France

J. Rose1,

1Aix Marseille Univ., CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France

J.-P. Ambrosi1

1Aix Marseille Univ., CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Levard, C., Borschneck, D., Grauby, O., Rose, J., Ambrosi, J.-P. (2018) Goethite, a tailor-made host for the critical metal scandium: The FexSc(1-x)OOH solid solution. Geochem. Persp. Let. 9, 16–20.

Work carried out thanks to financial support from CNRT (French National Centre for Technological Research: “Nickel and its environment”) for the “Scandium” project

Geochemical Perspectives Letters 9  |  doi: 10.7185/geochemlet.1832
Received 20 July 2018  |  Accepted 15 November 2018  |  Published 19 December 2018
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Table 1 Relative abundances of Sc measured by ICP-AES and EDX/TEM.
Samplesn Sc / (n Sc+Fe ) x 100
Nominal ICP-AESEDX/TEM
#10
#211.2 ± 0.011.2 ± 0.3
#355.8 ± 0.106.3 ± 1.3
#41518.3 ± 0.3017.9 ± 5.3
#52530.2 ± 0.3029.0 ± 4.6
#65057.9 ± 0.4049.9 ± 10.0
#77579.9 ± 1.1080.2 ± 1.3
#8 100100.0 ± 1.20

Calculated standard deviation based on the measurements of Fe and Sc concentrations on 5 replicates (ICP-AES), and on 10 particle aggregates (EDX/TEM).

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Figure 1 X-ray diffractograms for goethite, ScOOH and Sc-doped goethite samples.
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Figure 2 Top: Changes in cell parameters and in cell volume as a function of rate of substitution of Fe by Sc (numerical data for cell parameters and errors can be found in SI). Dashed lines represent ideal Vegard’s law behaviour. Bottom: Crystal structure of goethite. The octahedrons represent the Fe surrounded by 6 oxygen atoms. Spheres represent the hydrogen atoms.
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Figure 3 TEM images of samples #1 (a) (0 % Sc), #2 (b) (1.2 % Sc), #3 (c) (5.8 % Sc) #5 (d) (30.2 % Sc), #6 (e) (57.9 % Sc) and #8 (f) (100 % Sc). All images are at the same scale (a) except the inset in image (f).
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