The conversion of ammonium uranate prepared via sol-gel synthesis into uranium oxides

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The conversion of ammonium uranate prepared via sol-gel synthesis into uranium oxides. / Schreinemachers, Christian; Leinders, Gregory; Modolo, Giuseppe; Verwerft, Marc; Binnemans, Koen; Cardinaels, Thomas.

In: Nuclear Engineering and Technology, Vol. 52, No. 5, 05.2020, p. 1013-1021.

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Schreinemachers, Christian ; Leinders, Gregory ; Modolo, Giuseppe ; Verwerft, Marc ; Binnemans, Koen ; Cardinaels, Thomas. / The conversion of ammonium uranate prepared via sol-gel synthesis into uranium oxides. In: Nuclear Engineering and Technology. 2020 ; Vol. 52, No. 5. pp. 1013-1021.

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@article{f33d8827880a4c27bfae2dba454ea500,
title = "The conversion of ammonium uranate prepared via sol-gel synthesis into uranium oxides",
abstract = "A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the conversion reactions of ammonium uranates into uranium oxides. Two solid phases of the ternary system NH3 - UO3 - H2O were synthesised under specified conditions. Microspheres prepared by the sol-gel method via internal gelation were identified as 3UO3 - 2NH3 - 4H2O , whereas the product of a typical ammonium diuranate precipitation reaction was associated to the composition 3UO3 - NH3 - 5H2O. The thermal decomposition profile of both compounds in air feature distinct reaction steps towards the conversion to U3O8, owing to the successive release of water and ammonia molecules. Both compounds are converted into α-U3O8 above 550 °C, but the crystallographic transition occurs differently. In compound 3UO3 - NH3 - 5H2O (ADU) the transformation occurs via the crystalline β-UO3 phase, whereas in compound 3UO3 - 2NH3 - 4H2O (microspheres) an amorphous UO3 intermediate was observed. The new insights obtained on these uranate systems improve the information base for designing and synthesising minor actinide-containing target materials in future applications.",
keywords = "Nuclear fuel fabrication, Co-conversion, Internal gelation, ADU, UO3, U3O8",
author = "Christian Schreinemachers and Gregory Leinders and Giuseppe Modolo and Marc Verwerft and Koen Binnemans and Thomas Cardinaels",
note = "Score=10",
year = "2020",
month = may,
doi = "10.1016/j.net.2019.11.004",
language = "English",
volume = "52",
pages = "1013--1021",
journal = "Nuclear Engineering and Technology",
issn = "1738-5733",
publisher = "Elsevier",
number = "5",

}

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TY - JOUR

T1 - The conversion of ammonium uranate prepared via sol-gel synthesis into uranium oxides

AU - Schreinemachers, Christian

AU - Leinders, Gregory

AU - Modolo, Giuseppe

AU - Verwerft, Marc

AU - Binnemans, Koen

AU - Cardinaels, Thomas

N1 - Score=10

PY - 2020/5

Y1 - 2020/5

N2 - A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the conversion reactions of ammonium uranates into uranium oxides. Two solid phases of the ternary system NH3 - UO3 - H2O were synthesised under specified conditions. Microspheres prepared by the sol-gel method via internal gelation were identified as 3UO3 - 2NH3 - 4H2O , whereas the product of a typical ammonium diuranate precipitation reaction was associated to the composition 3UO3 - NH3 - 5H2O. The thermal decomposition profile of both compounds in air feature distinct reaction steps towards the conversion to U3O8, owing to the successive release of water and ammonia molecules. Both compounds are converted into α-U3O8 above 550 °C, but the crystallographic transition occurs differently. In compound 3UO3 - NH3 - 5H2O (ADU) the transformation occurs via the crystalline β-UO3 phase, whereas in compound 3UO3 - 2NH3 - 4H2O (microspheres) an amorphous UO3 intermediate was observed. The new insights obtained on these uranate systems improve the information base for designing and synthesising minor actinide-containing target materials in future applications.

AB - A combination of simultaneous thermal analysis, evolved gas analysis and non-ambient XRD techniques was used to characterise and investigate the conversion reactions of ammonium uranates into uranium oxides. Two solid phases of the ternary system NH3 - UO3 - H2O were synthesised under specified conditions. Microspheres prepared by the sol-gel method via internal gelation were identified as 3UO3 - 2NH3 - 4H2O , whereas the product of a typical ammonium diuranate precipitation reaction was associated to the composition 3UO3 - NH3 - 5H2O. The thermal decomposition profile of both compounds in air feature distinct reaction steps towards the conversion to U3O8, owing to the successive release of water and ammonia molecules. Both compounds are converted into α-U3O8 above 550 °C, but the crystallographic transition occurs differently. In compound 3UO3 - NH3 - 5H2O (ADU) the transformation occurs via the crystalline β-UO3 phase, whereas in compound 3UO3 - 2NH3 - 4H2O (microspheres) an amorphous UO3 intermediate was observed. The new insights obtained on these uranate systems improve the information base for designing and synthesising minor actinide-containing target materials in future applications.

KW - Nuclear fuel fabrication

KW - Co-conversion

KW - Internal gelation

KW - ADU

KW - UO3

KW - U3O8

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/36730397

U2 - 10.1016/j.net.2019.11.004

DO - 10.1016/j.net.2019.11.004

M3 - Article

VL - 52

SP - 1013

EP - 1021

JO - Nuclear Engineering and Technology

JF - Nuclear Engineering and Technology

SN - 1738-5733

IS - 5

ER -

ID: 5913234