Skip to main content Accessibility help
×
Home

Calcium Vanadinite: An Alternative Apatite Host for Cl-rich Wastes

  • M. R. Gilbert (a1)

Abstract

Apatites are often seen as good potential candidates for the immobilization of halide-rich wastes and, in particular, chlorapatite (Ca5(PO4)3Cl) has received much attention in recent years. However, synthesis of chlorapatite waste-forms can produce a complicated multi-phase system, with a number of secondary phases forming, including β-TCP (Ca3(PO4)2), spodiosite (Ca2(PO4)Cl) and pyrophosphate (Ca2P2O7), many of which require elevated temperatures and extended calcinations times to reduce. Calcium vanadinite (Ca5(VO4)3Cl) demonstrates a much simpler phase system, with calcination at 750 °C yielding Ca5(VO4)3Cl together a small quantity of a Ca2V2O7 secondary phase, the formation of which can be retarded by the addition of excess CaCl2. Characterization of compositions doped with SmCl3 as an inactive analogue for AnCl3 show the Cl to be immobilized in the vanadinite whilst the Sm forms a wakefieldite (SmVO4) phase.

Copyright

References

Hide All
1. Metcalfe, B. L., Donald, I. W., Fong, S. K., Gerrard, L. A., Strachan, D. M., Scheele, R. D., Mat. Res. Soc. Symp. Proc., 1124, 207 (2009).
2. Lee, W. E., Gilbert, M. R., Murphy, S. T., Grimes, R. W., J. Am. Ceram. Soc., 96, 2005 (2013).
3. Fong, S. K., Donald, I. W., Metcalfe, B. L., J. Alloys Comp., 444/445, 424 (2007).
4. Metcalfe, B. L., Donald, I. W., Fong, S. K., Gerrard, L. A., Strachan, D. M., Scheele, R. D., Mat. Res. Soc. Symp. Proc., 985, 157 (2007).
5. Fong, S. K., Metcalfe, B. L., Strachan, D., Scheele, R., Mat. Res. Soc. Symp. Proc., 1518, in press (2013).
6. Audubert, F., Carpena, J., Lacout, J. L., Tetard, F., Solid Sate Ionics, 95, 113 (1997).10.1016/S0167-2738(96)00570-X
7. Stennett, M. C., Pinnock, I. J., Hyatt, N. C., J. Nucl. Mater., 414, 352 (2011).
8. Kreidler, H., Am. Mineral., 55, 180 (1970)
9. Beck, H. P., Douiheche, M., Haberkorn, R., Kohlmann, H., Solid State Sci., 8, 64 (2006)
10. Gilbert, M. R., Mat. Res. Soc. Symp. Proc., 1518, in press (2013).10.1557/opl.2013.927
11. Liu, J., Lian, H., Shi, C., Sun, J., J. Electrochem. Soc., 152, 880 (2005).
12. Ding, W., Wang, J., Zhang, M., Zhang, Q., Su, Q., J. Solid State Chem., 179, 3582 (2006).
13. Karkada, N., Porob, D., Kumar, P., ECS Trans., 33, 39 (2010).
14. Rietveld, H. M., Acta Cryst., 22, 151 (1967).

Keywords

Calcium Vanadinite: An Alternative Apatite Host for Cl-rich Wastes

  • M. R. Gilbert (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed