Morphologic, Magnetic, and Mössbauer Spectral Properties of Fe₇₅>Co₂₅ Nanoparticles Prepared by Ultrasound-Assisted Electrochemistry

Abstract

Nanopowders of Fe75Co25 alloys have been prepared by ultrasound-assisted electrochemistry. Their composition, crystallographic structure, morphology, have been studied by X-ray diffraction, transmission electron microscopy, X-ray fluorescence, and high-energy electron diffraction. The nanopowders are found to present a composition well determined by the electrolyte bath composition, they show a bcc structure. The iron and cobalt atoms exhibit a very homogeneous distribution in the particles. The magnetic properties of the nanopowders have been measured between 5 and 295K with a vibrating sample magnetometer and their Mössbauer spectra have been obtained at 295K. The saturation magnetization is characteristic of FeCo alloys. The magnetic behavior and transmission electron microscopy observations of the particles indicate strongly interacting particles with a radius of ca. 2-4nm, particles which may form agglomerates of larger size. The measured average hyperfine field is situated at the maximum of the Slater-Pauling curve for the FeCo alloys.

Department(s)

Chemistry

Keywords and Phrases

Agglomeration; Cobalt Compounds; Electrochemistry; High Energy Electron Diffraction; Iron Compounds; Magnetic Properties; Morphology; Mössbauer Spectroscopy; Transmission Electron Microscopy; X Ray Diffraction Analysis; Crystallographic Structure; Hyperfine Field; Iron-cobalt Alloy; Magnetic Measurements; Nanostructured Materials; Nanoparticles

International Standard Serial Number (ISSN)

0304-8853

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 Elsevier, All rights reserved.

Publication Date

01 Oct 2004

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