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Articles:

ZHOU, T., COLIN, M., CANDOLFI, C., Boulanger, C., DAUSCHER, A., Santava, E., HEJTMANEK, J., BARANEK, P., AL RAHAL AL ORABI, R., POTEL, M., Fontaine, B., GOUGEON, P., Gautier, R. and LENOIR, B.
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

Samih, Y., Marcos, G., Stein, N., Allain, N., Fleury, E., Dong, C. and Grosdidier, T.
Surface and Coatings Technology,
2014

Mots clefs: High Current Pulsed Electron Beam Treatment (HCPEB) Surface hardening Corrosion Phase selection Phase transformation Martensitic steel

Resume: Abstract The surface of the AISI 420 martensitic stainless steel was subjected to High Current Pulsed Electron Beam (HCPEB) treatment. The microstructure in the melted layer consisted of a three phase mixture: (i) fine ?-Fe grains formed via epitaxial growth from the substrate, (ii) larger ?–grains nucleated from the top surface of the melt and (iii) some needles-like variants issued from the solid state martenitic transformation. Despite this complex multi-phase microstructure, the corrosion performance, tested in a sulfuric acid solution, was significantly enhanced by the HCPEB treatment. The increase in corrosion potential and delayed pitting are essentially attributed to an increase in Cr content, rising from 13.3 wt. % in the bulk to about 14 wt. % at the surface, together with a very limited amount of surface craters. This low density of craters did not give rise to significant deep hardening in the sub-surface but the top surface melted layer hardness was increased by more than 50% because of the triggering of the martensitic transformation.

Equipe: Département CP2S : Chimie et électrochimie des matériaux

Maas, M., Diliberto, S., de Vaulx, C., Azzouz, K. and Boulanger, C.
Journal Electronic Materials, 43(10):3857-3862
2014

Mots clefs: Bismuth telluride thick films soluble anode thermoelectric

Equipe: Département CP2S : Chimie et électrochimie des matériaux

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