Free Access
J. Phys. IV France
Volume 113, January 2004
Page(s) 111 - 114

J. Phys. IV France
113 (2004) 111
DOI: 10.1051/jp4:20040024

Solubilité de l'uranium dans les solutions solides d'apatite phospho-silicatée

R. El Ouenzerfi1, C. Goutaudier1, M.T. Cohen-Adad1, G. Panczer1, M.T. Ayedi2 and N.K. Ariguib2

1  Laboratoire de Physico-Chimie des Matériaux Luminescents, Bât. A Kastler, 5$^{\mbox{\`eme}}$ étage, Université Claude Bernard Lyon I, 43 Bd. du 11 novembre 1918, 69622 Villeurbanne Cedex, France
2  Laboratoire de Physico-Chimie Minérale, Faculté des Sciences de Bizerte, 7021 Zarzouna, Bizerte, Tunisie

The quaternary phase diagram CaO-La 2O 3-SiO 2-P 2O 5 was investigated in order to delimit an existence domain of single-phase oxy-silicophosphates. The studied samples were synthesized by high-temperature solid state reaction ( $1200\sim1400^{\circ}$C). The uranium solubility in Ca 5La 5(SiO 4) 3(PO 4) 3O 2 apatites was also studied. The obtained results exhibit that within the defined domain, it exists a solid solution between pure phosphate apatites Ca $_{\rm x}$La $_{\rm y}$(PO 4) 6O $_{\rm t}$ and pure silicate apatites Ca $_{\rm x}$La $_{\rm y}$(PO 4) 6O $_{\rm t}$. The uranium solubility in the Ca 5La 5(SiO 4) 3(PO 4) 3O 2 stoechiometry was found about 4.7% in cationic ratio.

© EDP Sciences 2004