2016 | |
Articles: | |
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Dalton Transactions,
45(Copyright (C) 2016 American Chemical Society (ACS). All Rights Reserved.):1259-1268
2016
Resume: The extn. of rare earth elements (REEs) from nitric acid soln. with a triphosphine trioxide (TPO) is presented. Performances of such a ligand in ionic liqs. vs. a classical solvent (benzyl ether) are compared. TPO seems to be 10 to 100 times more efficient when it is dissolved in ionic media whatever the concn. of nitric acid involved. Mechanistic investigations reveal that cation exchange classically obsd. in ionic liqs. is not consistent with the exptl. data. Moreover, clear differences in the TPO/Ln complexes between classical and ionic media are highlighted. A stable complex of 1 lanthanide for 3 TPO is formed in an ionic liq. whereas a complex of 1 lanthanide for 6 to 9 TPO is formed in benzyl ether. Back extn. is also studied and good recovery of REEs could be obtained. The TPO/ionic liq. system shows remarkable performances i.e. efficiency and selectivity towards lanthanides in a simulated leaching soln. of a Nd/Fe/B/Dy magnet. [on SciFinder(R)] Equipe: Département CP2S : Chimie et électrochimie des matériaux |
2014 | |
Articles: | |
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Science,
2014
Equipe: Département P2M : Nanomagnétisme et Electronique de Spin |
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PHYSICAL REVIEW B,
89(8)
2014
ISSN: 1098-0121
Equipe: Département P2M : Surfaces et Spectroscopies |
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JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA,
195:174-178
2014
ISSN: 0368-2048
Equipe: Département P2M : Surfaces et Spectroscopies |
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Physical Review Letters,
112(21)
2014
Equipe: Département P2M : Nanomagnétisme et Electronique de Spin |
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Journal of Alloys and Compounds,
587:303-307
2014
Equipe: Département CP2S : Expériences et Simulations des Plasmas Réactifs - Interaction plasma-surface et Traitement des Surfaces ESPRITS |
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JOURNAL OF ALLOYS AND COMPOUNDS,
587:303-307
2014
ISSN: 0925-8388
Equipe: Centre de Compétences : X-Gamma rayons X et spectroscopie |
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE,
640(5, SI):753-759
2014
ISSN: 0044-2313
Equipe: Département CP2S : Métallurgie et Surfaces |
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SURFACE AND INTERFACE ANALYSIS,
46(1, SI):397-400
Audinot, JN (Reprint Author), Ctr Rech Publ Gabriel Lippmann, SAM Dept, 41 Rue Brill, L-4422 Belvaux, Luxembourg. Audinot, J. -N.; Grysan, P.; Fleming, Y., Ctr Rech Publ Gabriel Lippmann, SAM Dept, L-4422 Belvaux, Luxembourg. Hamdan, A.; Noel, C.; Kosior, F.; Henrion, G.; Belmonte, T., Univ Lorraine, Inst Jean Lamour, CNRS, UMR 7198,CS 50840, F-54011 Nancy, France.
2014
ISSN: 0142-2421
DOI: 10.1002/sia.5635
Mots clefs: imaging; combinaison; characterization; plasma; nanosims; 3D Resume: The discharge between a platinum electrode and different metallic monolayers on a silicon substrate produced sub-micrometric structures. The scanning electron microscope images showed the formation of craters with cones, holes, corona, and other exotic structures. The atomic force microscopy images allowed evaluating the depth and height of these complex structures together with the chemical information as determined by NanoSIMS imaging. The plasma impacts locally removed the mono-layer and the bilayer down to the bare silicon substrate. In order to convert the acquired NanoSIMS images into a true three-dimensional distribution of the analyzed species, the SIMS images are overlapped with the corresponding atomic force microscopy images of the same probed area. This analysis method allows a visualization of a complex 3D structure and helps understand the formation mechanisms of the streamer impact. Copyright (c) 2014 John Wiley & Sons, Ltd. Equipe: Centre de Compétences : ERMIONE informatique et calcul |
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Chemistry of Materials,
26(16):4765-4775
2014
Resume: We present a detailed study of the evolution of the electrical, galvanomagnetic, and thermodynamic properties of polycrystalline AgxMo9Se11 compounds for 3.4 ? x ? 3.8 at low temperatures (2?350 K). In agreement with density functional theory calculations, the collected data show an overall gradual variation in the transport properties from metallic to semiconducting behavior on going from x = 3.4 to 3.8. The results evidence subtle variations in the electronic properties with the Ag content, typified by both positive and negative phonon-drag effects together with thermopower and Hall coefficient of opposite signs. Analysis of the data suggests that these features may be due to peculiarities of the dispersion of the valence bands in the vicinity of the chemical potential. A drastic influence of the Ag content on the thermal transport was evidenced by a pronounced change in the temperature dependence of the specific heat below 10 K. Nonlinearities in the Cp(T3) data are correlated to the concentration of Ag atoms, with an increase in x resulting in a more pronounced departure from a Debye law. The observed behavior mirrors that of ionic conductors, suggesting that AgxMo9Se11 for x ? 3.6 might belong to this class of compounds. Equipe: Département CP2S : Chimie et électrochimie des matériaux |