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

R. El Ouenzerfi; C. Goutaudier; M.T. Cohen-Adad; G. Panczer; M.T. Ayedi; N.K. Ariguib

doi:doi:10.1051/jp4:20040024

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Volume 113 (January 2004)

J. Phys. IV France, 113 (2004) 111-114

Abstract

Free Access

Issue		J. Phys. IV France Volume 113, January 2004


Page(s)		111 - 114
DOI		https://doi.org/10.1051/jp4:20040024

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

Abstract
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.