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Synthesis of Magnetite Particles by Pulsed Alexandrite Laser Processing of Metallic Glass Precursors

Published online by Cambridge University Press:  15 February 2011

Monica Sorescu ,
S.A. Schafer  and
E.T. Knobbe
Monica Sorescu
Affiliation:
Duquesne University, Physics Department, Pittsburgh, Pennsylvania 15282-1503
S.A. Schafer
Affiliation:
Oklahoma State University, Physics Department, Stillwater, Oklahoma 74078-0444
E.T. Knobbe
Affiliation:
Oklahoma State University, Chemistry Department, Stillwater, Oklahoma 74078-0447
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Abstract

Samples of Fe78B13Si9 and Fe81B13.5Si3.5C2 metallic glasses were irradiated with a pulsed alexandrite laser (λ=750 nm, τ=60 μs) using different laser fluences. Kinetics of laser-induced phase transformations and fluence dependence of magnetic properties were studied by scanning electron microscopy (SEM) and Mössbauer spectroscopy. Low laser fluences were found to induce changes in magnetic texture and onset of crystallization. High laser fluences, however, correlated with additional oxidation effects and the formation of stoichiometric Fe3O4 particles in the irradiated alloy system. An activation energy of 11.9 eV was estimated for the laser-driven synthesis of magnetite nanoparticles. Pulsed alexandrite laser processing is an intriguing alternative technique for the controlled synthesis of iron oxide phases from ferromagnetic glass precursors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 397: Symposium B – Advanced laser Processing of Materials-Fundamentals and Applications , 1995 , 393
Copyright
Copyright © Materials Research Society 1996

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References

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