Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9530361 | Geochimica et Cosmochimica Acta | 2005 | 17 Pages |
Abstract
The third step in our analysis involved consideration of ternary solid solutions with CaCO3 as the major end-member and any two of the seven considered Eu trace end-members. It was found that the three datasets can only be reproduced simultaneously with the ternary ideal solid solution EuH(CO3)2 - EuO(OH) - CaCO3, setting GEuH(CO3)2â = â1773 kJ molâ1 and GEuO(OH)â = â955 kJ molâ1, whereas all other end-member combinations failed. Our results are consistent with time-resolved laser fluorescence data for Cm(III) and Eu(III) indicating that two distinct species are incorporated in calcite: one partially hydrated, the other completely dehydrated. In conclusion, our study shows that substitution of trivalent for divalent cations in carbonate crystal structures is a more complex process than the classical isomorphic divalent-divalent substitution and may need consideration of multicomponent solid solution models.
Related Topics
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Authors
E. Curti, D.A. Kulik, J. Tits,