HAL : in2p3-00273074, version 1
 Structural behavior of $\beta$-thorium phosphate diphosphate ($\beta$-TPD) irradiated with ion beamsTamain C., Garrido F., Thomé L., Dacheux N., Ozgümüs A.Journal of Nuclear Materials 373 (2008) 378-386 - http://hal.in2p3.fr/in2p3-00273074
Physique/Physique/Chimie-Physique
Structural behavior of $\beta$-thorium phosphate diphosphate ($\beta$-TPD) irradiated with ion beams
C. Tamain1, F. Garrido2, L. Thomé2, N. Dacheux1, A. Ozgümüs1
 1 : IPNO - Institut de Physique Nucléaire d'Orsay http://ipnweb.in2p3.fr CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX France 2 : CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse http://www-csnsm.in2p3.fr/ CNRS : UMR8609 – IN2P3 – Université Paris XI - Paris Sud batiments 104 et 108 - 91405 Orsay Campus France
$\beta$-thorium phosphate diphosphate ceramic ($\beta$-TPD), $\beta$-Th4(PO4)4P2O7, was proposed as a potential actinide-bearing phase for nuclear waste storage. Self-irradiation by a-decays, due to the actinide loading, could affect the good intrinsic performances of this material. The evaluation of irradiation effects on the chemical durability of the ceramic is a crucial issue. Radiation effects were simulated by external ion beam irradiations. Under high-energy ion irradiation, amorphization was achieved above a critical threshold for electronic energy loss (Se = 5 MeV lm$\mu m^1$).Thermal annealing enables to fully recover the initial crystalline structure after heating for 15 h above 973 K. Amorphization appears thus completely reversible. The activation energy of annealing is equal to 2.8 eV. Ion beam induced amorphization and recrystallization by thermal annealing were found to be isotropic processes. Irradiations in the nuclear stopping regime lead to a complete amorphization of $\ beta$b-TPD at a critical dose of 0.2 dpa.

Articles dans des revues avec comité de lecture
2008
 Journal of Nuclear Materials (J. Nucl. Mater.) Publisher Elsevier ISSN 0022-3115 (eISSN : 0022-3115)
373
378-386

 in2p3-00273074, version 1 http://hal.in2p3.fr/in2p3-00273074 oai:hal.in2p3.fr:in2p3-00273074 Contributeur : Suzanne Robert <> Soumis le : Lundi 14 Avril 2008, 14:21:27 Dernière modification le : Lundi 14 Avril 2008, 14:49:39