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- W3128159042 abstract "In the context of a scientific program on long-lived radionuclide conditioning, a matrix for iodine 129 immobilization has been studied. A lead vanado-phosphate apatite was prepared from the melt of lead vanado-phosphate Pb{sub 3}(VO{sub 4}){sub 1.6}(PO{sub 4}){sub 0.4} and lead iodide PbI{sub 2} in stoichiometric proportions by calcination at 700 deg. C during 3 hours. Natural sintering of this apatite is not possible because the product decomposition occurs at 400 deg. C. Reactive sintering is the solution. The principle depends on the coating of lead iodide with lead vanado-phosphate. Lead vanado-phosphate coating is used as iodo-apatite reactant and as dense covering to confine iodine during synthesis. So the best condition to immobilize iodine during iodo-apatite synthesis is a reactive sintering at 700 deg. C under 25 MPa. We obtained an iodo-apatite surrounded with dense lead vanadate. Leaching behaviour of the matrix synthesized by solid-solid reaction is under progress in order to determine chemical durability, basic mechanisms of the iodo-apatite alteration and kinetic rate law. Iodo-apatite dissolution rates were pH and temperature dependent. We obtained a rate of 2.5 10{sup -3} g.m{sup -2}.d{sup -1} at 90 deg. C in initially de-ionised water. (authors)" @default.
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- W3128159042 date "2000-07-01" @default.
- W3128159042 modified "2023-09-27" @default.
- W3128159042 title "Iodine immobilization in apatites" @default.
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