Hostname: page-component-7bb8b95d7b-wpx69 Total loading time: 0 Render date: 2024-09-20T20:32:50.221Z Has data issue: false hasContentIssue false
  • English
  • Français

Hydrothermal Synthesis and Structure of Neptunium(V) Oxide

Published online by Cambridge University Press:  19 October 2011

Tori Z. Forbes ,
Peter C. Burns ,
L. Soderholm  and
S. Skanthakumar
Tori Z. Forbes
Affiliation:
tziemann@nd.edu, University of Notre Dame, Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick Hall, Notre Dame, IN, 46556, United States, 574-631-7216
Peter C. Burns
Affiliation:
pburns@nd.edu, University of Notre Dame, Department of Civil Engineering and Geological Sciences, 156 Fitzpatrick Hall, Notre Dame, IN, 46556, United States
L. Soderholm
Affiliation:
LS@anl.gov, Argonne National Laboratory, Chemistry Division, Argonne, IL, 60439, United States
S. Skanthakumar
Affiliation:
skantha@anl.gov, Argonne National Laboratory, Chemistry Division, Argonne, IL, 60439, United States
Get access

Abstract

Single crystals of Np2O5 have been synthesized by low-temperature hydrothermal reaction of a Np5+ stock solution with natural calcite crystals. The structure of Np2O5 was solved by direct methods and refined on the basis of F2 for all unique data collected on a Bruker X-ray diffractometer equipped with an APEX II CCD detector. Np2O5 is monoclinic, space group P2/c, with a = 8.168(2) Å, b = 6.584(1) Å, c = 9.3130(2) Å, β = 116.01(1)˚, V = 449.8(2) Å3, and Z = 1. The structure contains chains of edge-sharing neptunyl pentagonal bipyramids linked into sheets through cation-cation interactions with distorted neptunyl square bipyramids. Additional cation-cation interactions connect the sheets into a three-dimensional framework. The formation of Np2O5 on the surface of calcite crystals has important implications for the precipitation of isolated neptunyl phases in natural aqueous systems.

Keywords

actinidecrystallographic structurehydrothermal
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 985: Symposium NN – Scientific Basis for Nuclear Waste Management XXX , 2006 , 0985-NN12-02
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Silva, R.J. and Nitsche, H., Radiochim Acta. 70/71, 377 (1995).Google Scholar
2. Lieser, K.H. and Muhlenweg, U., Radiochim Acta. 43, 27 (1987).Google Scholar
3. Kaszuba, J.P and Runde, W.H., Env. Sci. Tech. 33, 4427 (1999).Google Scholar
4. Nitsche, H., Inorg Chim Acta. 127, 121 (1987).Google Scholar
5. Efurd, D. W. Wes, Runde, , Banar, J.C., Janecky, D.R, Kaszuba, J.P, Palmer, P.D., Roensch, F. R., and Tait., C.D., Env. Sci. Tech. 32, 3893 (1998).Google Scholar
6. Nitsche, H., Radiochim Acta. 52/53, 3 (1991).Google Scholar
7. Fahey, J.A., Turcotte, R.P., and Chikalla, T.D., J. Inorg. Nuc. Chem. 38, 495 (1976).Google Scholar
8. Pan, P., and Campbell, A.B., Radiochim. Acta. 78, 73 (1998).Google Scholar
9. Burns, P.C., Can. Min. 43, 1893 (2005).Google Scholar
10. Saine, M.-C., J. Less. Com. Metals. 154, 361 (1989).Google Scholar
11. Sullivan, J.C., Hindman, J.C., and Zielen, A.J., J. Am. Chem. Soc. 83, 3373 (1961).Google Scholar
12. Albrecht-Schmitt, T., Almond, P.M., and Sykora, R., Inorg. Chem. 42, 3788 (2003).Google Scholar
13. Cousson, A., Abazli, H., Nectoux, F., Jove, J., and Pages, M., J. Less Comm Metals. 99(2), 233 (1984).Google Scholar
14. Grigor'ev, M.S., Charushnikova, I.A., Krot, N.N., Yanovskii, A I., Struchov, Y.T., Zhurn. Neorg. Khim. 39(2), 179 (1994).Google Scholar
15. Krot, N.N., and Grigoriev, M.S., Russ. Chem. Rev. 73(1), 89 (2004).Google Scholar
16. Forbes, T.Z., and Burns, P.C., J. Sol. State Chem. 178, 3445 (2005).Google Scholar
17. Forbes, T.Z., and Burns, P.C., Am. Min. 91, 1089 (2006).Google Scholar
18. Forbes, T.Z., Burns, P.C., Soderholm, L., Skanthakumar., S., Chem. Mat. 18(6), 1643 (2006).Google Scholar
19. Forbes, T.Z., and Burns, P.C., unpublished, 2007.Google Scholar
20. Grigor'ev, M.S., Baturin, N.A., Bessonov, A.A., Krot, N.N., Radiokhimiya. 37(1) 15 (1995).Google Scholar
21. Grigor'ev, M.S., Fedoseev, A. M, Budantseva, N.A., Yanovskii, A. I., Krot, N.N., Radiokhimiya. 33(3) 54 (1991).Google Scholar
22. Grigor'ev, M.S., Yanovskii, A.I., Fedoseev, A.M., Budantseva, N.A., Struchkov, Y.T., Krot, N.N., Radiokhimiya. 33(2), 17 (1991).Google Scholar
23. Kubatko, K.-A., and Burns, P.C., Inorg. Chem. 45(25), 10277, (2006).Google Scholar
24. Nitsche, H., and Edelstein, N. M.,. Radiochim. Acta. 39, 23, (1985).Google Scholar
25. Grigor'ev, M.S., Yanovskii, A.I., Fedoseev, A.M., Budantseva, N.A., Struchkov, Y.T., Krot, N.N.,. Doklady Akademii Nauk SSSR. 300(3) 618 (1988).Google Scholar