Partitioning of Co2+ and Mn2+ into meridianiite (MgSO4·11H2O): ternary solubility diagrams at 270 K; cation site distribution determined by single-crystal time-of-flight neutron diffraction and density functional theory
Fortes, A.D. and Wood, I.G. and Hudson Edwards, Karen and Gutmann, M.J. (2017) Partitioning of Co2+ and Mn2+ into meridianiite (MgSO4·11H2O): ternary solubility diagrams at 270 K; cation site distribution determined by single-crystal time-of-flight neutron diffraction and density functional theory. Fluid Phase Equilibria , ISSN 0378-3812. (In Press)
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Abstract
We have grown single crystals of M2+SO4 hydrates at 270 K from aqueous solutions in the ternary systems CoSO4–MgSO4–H2O and MnSO4–MgSO4–H2O. These systems exhibit broad stability fields for a triclinic undecahydrate on the Mg-rich side (i.e., Co- or Mn-bearing meridianiite solid solutions) and stability fields for monoclinic heptahydrates on the Mg-poor side (i.e., Mg-bearing solid solutions of bieberite or mallardite). The solubility curves and distribution coefficients, describing the partitioning of M2+ ions between liquid and solid phases, have been determined by thermo-gravimetric and spectroscopic techniques. A subset of M2+SO4·11H2O specimens were selected for single-crystal time-of-flight neutron diffraction analysis in order to evaluate preferential occupancy of symmetry-inequivalent coordination polyhedra in the structure. Considering the nearly identical dimensions of the first coordination shells, there is a surprising difference in the distribution of Co and Mn over the two available sites.
Metadata
Item Type: | Article |
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Keyword(s) / Subject(s): | meridianiite, epsomite, bieberite, magnesium sulfate, cobalt sulfate, manganese sulfate, solubility, neutron diffraction |
School: | Birkbeck Faculties and Schools > Faculty of Science > School of Natural Sciences |
Depositing User: | Karen Hudson Edwards |
Date Deposited: | 13 Jan 2017 16:00 |
Last Modified: | 02 Aug 2023 17:30 |
URI: | https://eprints.bbk.ac.uk/id/eprint/17914 |
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