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The role of REE3+ in the crystallization of lanthanites

Published online by Cambridge University Press:  05 July 2018

Juan Diego Rodriguez-Blanco ,
Beatriz Vallina ,
Jesus A. Blanco  and
Liane G. Benning
Juan Diego Rodriguez-Blanco*
Affiliation:
Cohen Geochemistry Laboratory, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK Nano-Science Center, Department of Chemistry, University of Copenhagen, DK 2100 Copenhagen, Denmark
Beatriz Vallina
Affiliation:
Cohen Geochemistry Laboratory, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
Jesus A. Blanco
Affiliation:
Departamento de Física, Universidad de Oviedo, Oviedo, E-3007, Spain
Liane G. Benning
Affiliation:
Cohen Geochemistry Laboratory, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK GFZ German Research Centre for Geosciences, Helmholz Centre Potsdam, Telegrafenberg, 14473 Potsdam, Germany
*
* E-mail: [email protected]
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Abstract

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The formation of crystalline rare earth element (REE) (e.g. La, Ce, Pr, Nd) carbonates from aqueous solutions was examined at ambient temperature using UV-Vis spectrophotometry, combined with X-ray diffraction, high-resolution microscopy and infrared spectroscopy. In all experiments REE-lanthanites (REE2(CO3)3·8H2O) formed via a highly hydrated, nanoparticulate and poorlyordered REE-carbonate precursor. The lifetime of this precursor as well as the kinetics of crystallization of the various REE-lanthanites were dependent on the specific REE3+ ion involved in the reaction. The induction time and the time needed to fully form the crystalline REE-lanthanite end products increase linearly with the ionic potential. The authors show here that the differences in ion size and ionic potential as well as differences in dehydration energy of the REE3+ ions control the lifetime of the poorly ordered precursor and thus also the crystallization kinetics of the REE-lanthanites; furthermore, they also affect the structural characteristics (e.g. unit-cell dimensions and idiomorphism) of the final crystalline lanthanites.

Keywords

lanthaniteREEionic potentialcarbonatitecrystallizationamorphous precursors
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 6 , November 2014 , pp. 1373 - 1380
Creative Commons
Creative Common License - CCCreative Common License - BY
© [2014] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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