Evaluation of the thermal stability under ...
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Article dans une revue scientifique
DOI :
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Title :
Evaluation of the thermal stability under air of the uranyl peroxide nanocluster (NH4)40[(UO2)32(O2)40(OH)24]⋅nH2O
Author(s) :
Imbert, Paul-Henri [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tougait, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Devaux, Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Henry, Natacha [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Ellart, Marine [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Abraham, Francis [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Nos, Jérémy [Auteur]
AREVA
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Tougait, Olivier [Auteur]

Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Devaux, Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Henry, Natacha [Auteur]

Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Ellart, Marine [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Abraham, Francis [Auteur]

Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Nos, Jérémy [Auteur]
AREVA
Journal title :
Progress in Nuclear Science and Technology
Volume number :
5
Pages :
144-147
Publication date :
2018-11
English keyword(s) :
thermal decomposition
chemical analysis
infrared spectrum
powder X- ray diffraction
uranium oxide
pseudomorphic decomposition
chemical analysis
infrared spectrum
powder X- ray diffraction
uranium oxide
pseudomorphic decomposition
HAL domain(s) :
Chimie/Chimie inorganique
Chimie/Matériaux
Chimie/Matériaux
English abstract : [en]
The synthesis, characterization and thermal decomposition of the uranyl peroxide nanocluster(NH4)40[(UO2)32(O2)40(OH)24]. nH2O, designated as U32R-NH4, are presented for a series of ...
Show more >The synthesis, characterization and thermal decomposition of the uranyl peroxide nanocluster(NH4)40[(UO2)32(O2)40(OH)24]. nH2O, designated as U32R-NH4, are presented for a series of temperatures ranging from 20 to 800°C. The handlings and annealing were carried out under air and the post-treatment characterizations were managed back to room temperature. The identification of the intermediate compounds was achieved by chemical analysis, infrared spectroscopy and powder X-ray diffraction. The proposed decomposition scheme up to U3O8 comprises three main steps; (i) the low temperature range, from room temperature to 190°C, is characterized by the loss of the molecular species, water molecules, ammonium and peroxo ions, (ii) the intermediate temperature range, from 190 to 590°C, involves mostly structural rearrangements and release of oxygen and nitrogen species, and (iii) the high temperature range, above 590°C, which is associated to the UO3 – U3O8 transition accompanied with O2 release. The thermal treatment up to 800°C does not alter the morphological features of the initial powder suggesting a pseudomorphic decomposition. Upon ageing or heating, the starting compound, (NH4)40[(UO2)32(O2)40(OH)24].nH2O, readily loses its crystallinity.Show less >
Show more >The synthesis, characterization and thermal decomposition of the uranyl peroxide nanocluster(NH4)40[(UO2)32(O2)40(OH)24]. nH2O, designated as U32R-NH4, are presented for a series of temperatures ranging from 20 to 800°C. The handlings and annealing were carried out under air and the post-treatment characterizations were managed back to room temperature. The identification of the intermediate compounds was achieved by chemical analysis, infrared spectroscopy and powder X-ray diffraction. The proposed decomposition scheme up to U3O8 comprises three main steps; (i) the low temperature range, from room temperature to 190°C, is characterized by the loss of the molecular species, water molecules, ammonium and peroxo ions, (ii) the intermediate temperature range, from 190 to 590°C, involves mostly structural rearrangements and release of oxygen and nitrogen species, and (iii) the high temperature range, above 590°C, which is associated to the UO3 – U3O8 transition accompanied with O2 release. The thermal treatment up to 800°C does not alter the morphological features of the initial powder suggesting a pseudomorphic decomposition. Upon ageing or heating, the starting compound, (NH4)40[(UO2)32(O2)40(OH)24].nH2O, readily loses its crystallinity.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
ENSCL
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Collections :
Research team(s) :
Chimie, matériaux et procédés pour un nucléaire durable (CIMEND)
Matériaux hybrides (MATHYB)
Matériaux hybrides (MATHYB)
Submission date :
2019-09-25T15:12:29Z
2021-03-02T14:50:08Z
2021-03-02T14:50:08Z