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23 results on '"Campayo, Lionel"'

9. Structural modifications induced by AgI in silver aluminophosphate glasses and their consequence on thermal properties.

Author

Lemesle, Thomas, Campayo, Lionel, and Méara, François O.

Subjects
SILVER phosphates, THERMAL properties, IODINE isotopes, ALUMINOPHOSPHATES, PHOSPHATE glass, SILVER, ALUMINUM oxide
Abstract

Silver phosphate glass-forming systems are potential host matrices for the conditioning of radioactive iodine. Large amounts of iodine can be incorporated in these glasses without significant volatilisation and their phosphate network can be strengthened thanks to its crosslinking by aluminum ions. Three series of glasses, corresponding to Ag2O/P2O5 molar ratios of 1, 1·66 and 2, with and without alumina (up to 3 mol%), have been studied for different iodine contents (0 to 1·2 vol%). The influence of AgI content was assessed by 31P and 27Al NMR characterisations. In the series with Ag2O/P2O5=2, the formation of a glassy fraction is observed for an iodine content beyond 0·4 vol% whereas these materials were entirely crystallised without AgI. For this glassy fraction, we confirm that AgI is inserted in the aluminophosphate glassy network. Progressive insertion of AgI in glassy compositions eventually induces a crystallisation phenomenon at the highest proportions corresponding to an exclusion of alumina from the network and the formation of aluminophosphate phases such as Al(PO3)3 or AlPO4. This phenomenon involves structural and thermal modifications, which enable to propose an optimum iodine content (around 0·6 vol%) that can be inserted under the form of AgI in these glasses for iodine conditioning. [ABSTRACT FROM AUTHOR]

Published
2021
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10. Radioactive iodine conditioning in silver phosphate glasses

Author

Chabauty, Anne-Lise, Campayo, Lionel, Mear, François, Montagne, Lionel, Pinet, Olivier, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
[CHIM.INOR]Chemical Sciences/Inorganic chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

11. Reinvestigation of the crystal structure of Ca 2 Ce 8 (SiO 4 ) 6 O 2 apatite by Rietveld refinement

Author

Massoni , Nicolas, Hegron , Ronan, Campayo , Lionel, CEA-Direction de l'Energie Nucléaire ( CEA-DEN ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), and Laboratoire d'études de Matériaux Céramiques pour le Conditionnement ( LM2C )

Subjects
[ CHIM.CRIS ] Chemical Sciences/Cristallography, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

13. Bismuth silver phosphate glasses as alternative matrices for the conditioning of radioactive iodine

Author

Lemesle, Thomas, Montagne, Lionel, Méar, François, Revel, Bertrand, Campayo, Lionel, Pinet, Olivier, Unité de Catalyse et Chimie du Solide - UMR 8181 (UCCS), Centrale Lille Institut (CLIL)-Université d'Artois (UA)-Centrale Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Lille, Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Centre Commun de Mesure de RMN, Université de Lille, Sciences et Technologies, Laboratoire d'études de Matériaux Céramiques pour le Conditionnement (LM2C), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université d'Artois (UA)-Centrale Lille-Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM), and Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

14. ACTI39 Iodate-substituted hydroxyapatite sintering at low temperature by SPS

Author

Coulon, Antoine, Campayo, Lionel, Grandjean, D., Laurencin, Danielle, Rossignol, Sylvie, Laboratoire d'études de Matériaux Céramiques pour le Conditionnement (LM2C), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Rossignol, Sylvie

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2014

15. 87Sr,119Sn,127I Single and {1H/19F}-Double Resonance Solid-State NMR Experiments: Application to Inorganic Materials and Nanobuilding Blocks

Author

Laurencin, Danielle, primary, Ribot, François, additional, Gervais, Christel, additional, Wright, Adrian J., additional, Baker, Annabelle R., additional, Campayo, Lionel, additional, Hanna, John V., additional, Iuga, Dinu, additional, Smith, Mark E., additional, Nedelec, Jean‐Marie, additional, Renaudin, Guillaume, additional, and Bonhomme, Christian, additional

Published
2016
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16. Reinvestigation of the crystal structure of Ca2Ce8(SiO4)6O2 apatite by Rietveld refinement.

Author

Massoni, Nicolas, Hegron, Ronan, and Campayo, Lionel

Subjects
APATITE derivatives, RIETVELD refinement, CRYSTAL structure
Abstract

Ca2lN8(SiO4)6O2 apatites with Ln = La, Ce, Pr, Nd, Sm, Eu, Gd and Tb crystallize in space group P63/m. The crystal structure of apatite-type Ca2Ce8(SiO4)6O2 [dicalcium octacerium hexakis(silicate) dioxide], which has been synthesized by calcination, was refined from powder X-ray diffraction data using the Rietveld method. A database survey shows that contrary to the previously published Ca2Ce8(SiO4)6O2 structure [Skakle et al. (2000). Powder Diffr. 15, 234-238], the cell volume of the structure reported here is consistent with those of other Ln apatites. [ABSTRACT FROM AUTHOR]

Published
2018
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17. French Studies on the Development of Potential Conditioning Matrices for Iodine 129

Author

Campayo, Lionel, primary, Audubert, Fabienne, additional, Lartigue, Jean-Eric, additional, Courtois-Manara, Eglantine, additional, Le Gallet, Sophie, additional, Bernard, Frédéric, additional, Lemesle, Thomas, additional, Mear, François O., additional, Montagne, Lionel, additional, Coulon, Antoine, additional, Laurencin, Danielle, additional, Grandjean, Agnès, additional, and Rossignol, Sylvie, additional

Published
2015
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18. Sintering of lead phospho-vanadate by spark plasma sintering

Author

Campayo, Lionel, Le Gallet, Sophie, Bart, Florence, Grin, Yuri, Bernard, Frédéric, Laboratoire d'études de Matériaux Céramiques pour le Conditionnement ( LM2C ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Laboratoire Interdisciplinaire Carnot de Bourgogne ( LICB ), Université de Bourgogne ( UB ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire d'études de Matériaux Céramiques pour le Conditionnement (LM2C), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), and Bernard, Frédéric

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, [ CHIM.MATE ] Chemical Sciences/Material chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2009

23. Reinvestigation of the crystal structure of Ca 2 Ce 8 (SiO 4 ) 6 O 2 apatite by Rietveld refinement.

Author

Massoni N, Hegron R, and Campayo L

Abstract

Ca 2 Ln 8 (SiO 4 ) 6 O 2 apatites with Ln = La, Ce, Pr, Nd, Sm, Eu, Gd and Tb crystallize in space group P 6 3 / m . The crystal structure of apatite-type Ca 2 Ce 8 (SiO 4 ) 6 O 2 [dicalcium octa-cerium hexa-kis-(silicate) dioxide], which has been synthesized by calcination, was refined from powder X-ray diffraction data using the Rietveld method. A database survey shows that contrary to the previously published Ca 2 Ce 8 (SiO 4 ) 6 O 2 structure [Skakle et al. (2000 ▸). Powder Diffr. 15 , 234-238], the cell volume of the structure reported here is consistent with those of other Ln apatites.

Published
2018
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