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Structural, Magnetic and Hyperfine Properties of Molybdenum Dioxide-Hematite Mixed Oxide Nanostructures

Published online by Cambridge University Press:  03 May 2018

Richard Trotta ,
Felicia Tolea ,
Mihaela Valeanu ,
Lucian Diamandescu ,
Agnieszka Grabias  and
Monica Sorescu
Richard Trotta
Affiliation:
Duquesne University, Department of Physics, Pittsburgh, PA 15282, USA
Felicia Tolea
Affiliation:
National Institute of Materials Physics, P.O. Box MG-7, 077125 Bucharest-Magurele, Romania
Mihaela Valeanu
Affiliation:
National Institute of Materials Physics, P.O. Box MG-7, 077125 Bucharest-Magurele, Romania
Lucian Diamandescu
Affiliation:
National Institute of Materials Physics, P.O. Box MG-7, 077125 Bucharest-Magurele, Romania
Agnieszka Grabias
Affiliation:
Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw, Poland
Monica Sorescu*
Affiliation:
Duquesne University, Department of Physics, Pittsburgh, PA 15282, USA
*
*(Email: [email protected])
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Abstract

MoO2-Fe2O3 nanoparticle system was successfully synthesized by mechanochemical activation of MoO2 and α-Fe2O3 equimolar mixtures for 0-12 hours of ball milling time. The study aims at exploring the formation of magnetic oxide semiconductors at the nanoscale. X-ray powder diffraction (XRD), Mössbauer spectroscopy and magnetic measurements were used to study the phase evolution of MoO2-Fe2O3 nanoparticle system under the mechanochemical activation process. The Mössbauer studies showed that the spectrum of the mechanochemically activated composites evolved from a sextet for hematite to sextet and a doublet upon duration of the milling process with molybdenum dioxide. Recoilless fraction was determined using our dual absorber method and was found to decrease with increasing ball milling time. Magnetic measurements recorded at 5 and 300 K in an applied magnetic field of 50,000 Oe showed the magnetic properties in the antiferromagnetic and canted ferromagnetic states. The Morin transformation was evidenced by zero-field cooling-field cooling (ZFC-FC) measurements in 200 Oe and the transformation characteristic temperatures were shifted to lower values.

Keywords

nanostructuremagneticmechanical alloying
Type
Articles
Information
MRS Advances , Volume 3 , Issue 47-48: Nanomaterials , 2018 , pp. 2887 - 2892
Copyright
Copyright © Materials Research Society 2018 

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