Hydrothermal synthesis and characterization of the thorium phosphate hydrogenphosphate, thorium hydroxide phosphate, and dithorium oxide phosphate

Journal Article · Fri Jun 01 00:00:00 EDT 2001 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.2001.9143· OSTI ID:782907

Brandel, V ^[1]; Dacheux, N; Genet, M; Podor, R

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1. Institut de Physique Nucleaire, Universite de Paris, Orsay (France)

Because of its low solubility in water and its high thermal stability, thorium phosphate diphosphate (TPD), Th{sub 4}(PO{sub 4}){sub 4}P{sub 2}O{sub 7}, seems to be a very good matrix for radionuclide immobilization. During the leaching studies of this compound the formation of a new phase, different from TPD was observed. In order to identify this phase, two other thorium phosphates--thorium phosphate-hydrogenphosphate (TPHP), Th{sub 2}(PO{sub 4}){sub 2}HPO{sub 4}{center_dot}H{sub 2}O, and thorium hydroxide phosphate (THOP), Th(OH)PO{sub 4}--were synthesized in hydrothermal conditions and then characterized. The neoformed phase appeared to be identical to the TPHP.

• Research Organization: Institut de Physique Nucleaire, Groupe de Radiochimie, Universite de Paris, Orsay (FR); Faculte des Sciences, Laboratoire de Chimie du Solide Mineral, Universite H. Poincare, Nancy, Vavdoeuvre-les-Nancy Cedex (FR)
• Sponsoring Organization: None (US)
• OSTI ID: 782907
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 159; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
LEACHING
PHASE STUDIES
RADIONUCLIDE MIGRATION
SOLUBILITY
STABILITY
THORIUM HYDROXIDES
THORIUM OXIDES
THORIUM PHOSPHATES
X-RAY DIFFRACTION