Pu, U, and Hf incorporation in Gd silicate apatite

Vance, ER; Ball, CJ; Begg, BD; Carter, ML; Day, RA; Thorogood, GJ

Pu, U, and Hf incorporation in Gd silicate apatite

Date

2004-12-20

Authors

Publisher

John Wiley & Sons, Inc

Abstract

Trivalent Pu can be incorporated in the silicate apatite structure to form Ca2Pu8(SiO4)6O2 by sintering under reducing conditions, while the incorporation of tetravalent Pu in the Ca/rare earth sites in oxidizing or neutral conditions is limited to only 0.6 formula units (f.u.). The d-spacings and intensities of the X-ray pattern of hexagonally structured Ca2Pu8(SiO4)6O2 after firing at 1250°C are given, and the a and c lattice parameters are 0.95611 and 0.70281 nm, respectively. The respective solid solubility limits of U and Hf in Ca2Gd8–x(U/Hf)x(SiO4)6O2 apatite samples were 0.3 and 0.2 f.u. © 2004 The American Ceramic Society

Keywords

Apatites, Silicates, Uranium, Uranium compounds, Plutonium, Hafnium, Hafnium compounds

Citation

Vance, E. R., Ball, C. J., Begg, B. D., Carter, M. L., Day, R. A., & Thorogood, G. J. (2003). Pu, U, and Hf incorporation in Gd silicate apatite. Journal of the American Ceramic Society, 86(7), 1223-1225. doi:10.1111/j.1151-2916.2003.tb03455.x