Aerosol nanoparticles in the Fe <inf>1-x</inf>Cr <inf>x</inf> system: Room-temperature stabilization of the σ phase and σ→α -phase transformation

M. Gich, E. A. Shafranovsky, A. Roig, A. Ślawska-Waniewska, K. Racka, Ll Casas, Yu I. Petrov, E. Molins, M. F. Thomas

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Abstract

The production and structural characterization of gas-evaporated nanoparticles in the Fe1-x Crx system, with 0<x<0.83 are reported. The results show that for x∼0.5 the metastable σ-FeCr can be stabilized and it constitutes up 60 wt % of the material. The sample with the highest σ-FeCr content is further analyzed to study the structural and the magnetic properties of this phase and its thermal stability. The σ-FeCr phase is weakly magnetic with an average magnetic moment of 0.1 μB per Fe atom and a Curie temperature below ∼60 K. It is stable up to 550 K where it starts to transform to bcc-FeCr. Annealing at 700 K yields Cr2 O3 due to Cr surface segregation and affects the magnetic behavior of the system, which is dominated by interparticle interactions. © 2005 American Institute of Physics.
Original languageEnglish
Article number024303
JournalJournal of Applied Physics
Volume98
Issue number2
DOIs
Publication statusPublished - 15 Jul 2005

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