Pressure-induced effects on the structural properties of iron selenides produced by mechano-synthesis.

C.E.M. Campos (1) , J.C.-De Lima (1) , T.A. Grandi (1) , K.D. Machado (1) , J.P. Itié (2) , A. Polian (2)

1 Departamento de Física
2 IMPMC - Institut de minéralogie et de physique des milieux condensés

Extended x-ray absorption fine structure studies were performed to follow the structural behaviour of FeSe2 and FeSe/Fe7Se8 nanocrystalline phases produced from a mechanically alloyed Fe25Se75 mixture when exposed to high pressure. A phase transition from marcasite FeSe2 to NiAs-type FeSe/Fe7Se8 was previously reported when the milling time was increased from 20 to 62 h; this study proposes to verify the possibility of inducing the same phase transition in high-pressure experiments using a diamond anvil cell.

C.E.M. Campos, J.C.-De Lima, T.A. Grandi, K.D. Machado, J.P. Itié, et al.. Pressure-induced effects on the structural properties of iron selenides produced by mechano-synthesis.. Journal of Physics: Condensed Matter, 2004, 16, pp.8485-8490. ⟨10.1088/0953-8984/16/47/003⟩. ⟨hal-00087536⟩