EXAFS and Raman studies of mechanical alloyed Ni25Se75 mixture under high-pressure conditions. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solid State Chemistry Année : 2005

EXAFS and Raman studies of mechanical alloyed Ni25Se75 mixture under high-pressure conditions.

Résumé

Extended X-ray Absorption Fine Structure and Raman studies were performed to follow the structural and vibrational behavior of a mechanical alloyed Ni25Se75 mixture, containing nanocrystalline pyrite NiSe2 phase, when exposed to high-pressure conditions. An increase in the local structural order of the nanocrystalline phase with pressure increasing was observed by means of Debye–Waller factor analysis. The relative Ni nearest-neighbors distances were determined as a function of pressure, which were used to determine the inverse linear compressibility of the nanocrystalline pyrite NiSe2 alloy as well as its derivate by means of Murnaghan's equation. The Raman results showed tentative NiSe2 phonons dispersion with pressure that becomes a difficult task since the existence/photo-induced nucleation of an important amount of nanocrystalline Se, detected due to the observation of its pressure-induced phase transitions.

Dates et versions

hal-00020187 , version 1 (07-03-2006)

Identifiants

Citer

C.E.M. Campos, J.C. de Lima, T.A. Grandi, K.D. Machado, J.P. Itié, et al.. EXAFS and Raman studies of mechanical alloyed Ni25Se75 mixture under high-pressure conditions.. Journal of Solid State Chemistry, 2005, 178, pp.93-99. ⟨10.1016/j.jssc.2004.10.006⟩. ⟨hal-00020187⟩
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