Structural andopticalstudiesofFeSb2 under highpressure

C.M. Poffo (1) , S.M. Souza (1) , D.M. Triches (1) , J.C. de Lima (2) , T.A Grandi (2) , A. Polian (3) , Mélanie Gauthier (3)

1 Departamento de Engenharia Mecanica
2 Departamento deFısica, UniversidadeFederaldeSantaCatarina,CampusUniversita'rio Trindade
3 IMPMC - Institut de minéralogie et de physique des milieux condensés

NanostructuredorthorhombicFeSb2 wasformedalongwithanamorphousphase,bymechanical alloyingfromamixtureofFeandSbpowders.Theinfluenceofpressureonthestructuralandoptical propertiesofthematerialwasinvestigatedbyX-raydiffraction(XRD)andRamanspectroscopy(RS)up to 28.2and45.2GPa,respectively.Thevolumefractionoftheamorphousphaseincreasedwith increasingpressure.Forpressuresabove14.3GPa,atetragonalFeSb2 phase wasalsoobserved.Forthe orthorhombicFeSb2 phase,thepressuredependenceofthevolumefittedtoaBirch-Murnaghan equationofstategaveabulkmodulus B0¼75.573.2 GPa,anditsderivative B0 0¼7.270.7. Forthe orthorhombicFeSb2 phase,theRamanactive A2 g modewasobservedupto28.3GPa,whilethe B21 g mode was notforpressureslargerthan14GPa.Forpressuresabove21GPa,theRamanactive A1g mode ofa tetragonalFeSb2 phase wasobserved

Mots clés: Nanocrystals; Thermoelectric materials; Mechanical alloying; X-ray diffraction; Raman spectroscopy; High pressure

Domaines: Autre [cond-mat.other]

C.M. Poffo, S.M. Souza, D.M. Triches, J.C. de Lima, T.A Grandi, et al.. Structural andopticalstudiesofFeSb2 under highpressure. Physica B: Condensed Matter, 2012, 407, pp.4686-4694. ⟨10.1016/j.physb.2012.08.032⟩. ⟨hal-00742196⟩