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Complexe metallic alloys surfaces : structure, properties and nanostructuration

Abstract : We report the investigation of pseudo-ten-fold surfaces on two complex metallic alloys considered as approximants to the decagonal quasicristal. The atomic and electronic structure of the both samples is investigated by means of a multi-technique approach supported by ab initio electronic structure calculations. The main termination of the (100) surface of Al13Co4 is attributed to an incomplete puckered layer. The (010) surface of Al3(Mn, Pd) exhibits an important amount of structural imperfections. With the exception of several vacancies, this surface is identical to the complete puckered layer. In a second stage, both surfaces have been used as templates for the growth of metallic thin films. On both surfaces, Pb adatoms adopt a pseudomorphic growth mode up to one monolayer. For the Al13Co4 surface, the sticking coefficient of Pb vanishes upon the completion of the monolayer. However, it remains sufficient for the growth of additional layers on the Al3(Mn, Pd) (010) surface. The adsorption of Cu on the Al13Co4 surface follows also a pseudomorphic growth mode up to one monolayer. The ß-Al(Cu, Co) phase appears for coverages greater than one monolayer. For higher temperature deposition, the b-phase is followed by the formation of the g-Al4Cu9 phase. Both b and g phases grow as two (110) domains rotated by 72° from each other
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Rafik Addou. Complexe metallic alloys surfaces : structure, properties and nanostructuration. Other. Institut National Polytechnique de Lorraine, 2010. English. ⟨NNT : 2010INPL011N⟩. ⟨tel-01748859⟩



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