Thermochemical characterization of Ca4La6(SiO4)6(OH)2 a synthetic La- and OH-analogous of britholite: implication for monazite and LREE apatites stability

• Autorzy: Janots E. , Brunet F. , Goffe B. , Poinssot C. , Burchard M. , Cemic L.

Identyfikatory

DOI

10.2478/v10002-008-0003-7

• Języki publikacji: EN

Abstrakty

EN

In this contribution, monazite (LREEPO4) solubility is addressed in a chemical system involving REE-bearing hydroxylapatite, (Ca,LREE)10(PO4,SiO4)6(OH)2. For this purpose, a synthetic (La)- and (OH)-analogous of britholite, Ca4La6(SiO4)6(OH)2, was synthesised and its thermodynamic properties were measured. Formation enthalpy of –14,618.4 ± 31.0 kJ·mol–1 was obtained by high-temperature drop-solution calorimetry using a Tian-calvet twin calorimeter (Bochum, Germany) at 975 K using lead borate as solvent. Heat capacities (Cp) were measured in the 143–323 K and 341–623 K ranges with an automated Perkin-Elmer DSC 7. For calculations of solubility diagrams at 298 K, the GEMS program was used because it takes into account solid solutions. In conditions representative of those expected in nuclear waste disposal, calculations show that La-monazite is stable from pH = 4 to 9 with a minimum of solubility at pH = 7. La-bearing hydroxylapatite precipitates at pH > 7 with a nearly constant composition of 99% hydroxylapatite and 1% La-britholite. Each mineral buffers solution at extremely low lanthanum concentrations (log{La} = 10–10–10–15 mol·kg–1 for pH = 4 to 13). In terms of chemical durability, both La-monazite and La-rich apatite present low solubility, a requisite property for nuclear-waste forms.

Słowa kluczowe

EN

monazite; britholite; apatite; calorimetry; nuclear waste form

• Wydawca: Mineralogical Society of Poland
• Czasopismo: Mineralogia
• Rocznik: 2008
• Tom: Vol. 39, iss. 1/2
• Strony: 41--52
• Opis fizyczny: Bibliogr. 49 poz., tab., wykr.

Twórcy

autor

Janots E.

• Institut für Geologie, University of Bern, Switzerland
• Institut für Mineralogie, WWU Münster, Germany

autor

Brunet F.

• Laboratoire de Géologie, CNRS UMR8538, Paris, France

autor

Goffe B.

• Laboratoire de Géologie, CNRS UMR8538, Paris, France

autor

Poinssot C.

• DEN/DPC/SECR, CEA, Saclay, France

autor

Burchard M.

• Mineralogisches Institut, Universität-Heidelberg, Germany

autor

Cemic L.

• Institut für Geowissenschaften, Universität Kiel, Germany

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