Elzinga, E.J. and Reeder, R.J. and Withers, S.H. and Peale, R.E. and Mason, R.A. and Beck, K.M. and Hess, W.P. (2002) EXAFS study of rare-earth element coordination in calcite. Geochimica et Cosmochimica Acta, 66 (16). pp. 2875-2885. ISSN 1872-9533
PDF (Migrated (PDF/A Conversion) from original format: (application/pdf))
- Published Version
Available under License Creative Commons Attribution Non-commercial.
Extended X-ray absorption fine-structure (EXAFS) spectroscopy is used to characterize the local coordination of selected rare-earth elements (Nd3+, Sm3+, Dy3+, Yb3+) coprecipitated with calcite in minor concentrations from room-temperature aqueous solutions. Fitting results confirm substitution in the Ca site, but first-shell Nd-O and Sm-O distances are longer than the Ca-O distance in calcite and longer than what is consistent with ionic radii sums for sixfold coordination in the octahedral Ca site. In contrast, first-shell Dy-O and Yb-O distances are shorter than the Ca-O distance and are consistent with ionic radii sums for sixfold coordination. Comparison of Nd-O and Sm-O bond lengths with those in lanthanide sesquioxides and with ionic radii trends across the lanthanide series suggests that Nd3+ and Sm3+ have sevenfold coordination in a modified Ca site in calcite. This would require some disruption of the local structure, with an expected decrease in stability, and possibly a different charge compensation mechanism between Nd and Sm vs. Yb and Dy. A possible explanation for the increased coordination for the larger rare-earth elements involves bidentate ligation from a CO3 group. Because trivalent actinides such as Am3+ and Cm3+ have ionic radii similar to Nd3+, their incorporation in calcite may result in a similar defect structure.
|Keywords:||calcite; crystal chemistry; crystal structure; rare earth element; spectroscopy|
|Department(s):||Science, Faculty of > Earth Sciences|
|Date:||4 June 2002|
Actions (login required)