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Role of Oxidation State of Vanadium in Vanadium Oxide-Hematite Nanoparticles

Published online by Cambridge University Press:  08 March 2013

Monica Sorescu ,
Tianhong Xu  and
Collin Wade
Monica Sorescu
Affiliation:
Duquesne University, Department of Physics, Fisher Hall, Pittsburgh, PA 15282-0321, USA
Tianhong Xu
Affiliation:
Duquesne University, Department of Physics, Fisher Hall, Pittsburgh, PA 15282-0321, USA
Collin Wade
Affiliation:
Duquesne University, Department of Physics, Fisher Hall, Pittsburgh, PA 15282-0321, USA
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Abstract

Single phase, a FeVO4 triclinic crystalline structure was successfully synthesized by annealing the mechanochemically milled xV2O5·(1-x)α-Fe2O3 composites (x = 0.5) at 550 °C for 1 h. X-ray powder diffraction (XRD) and Mössbauer spectroscopy were combined for a detailed study of the assisting role of the mechanochemical milling process. Mechanochemical milling homogeneously mixed the starting materials of α-Fe2O3 and V2O5 and substantially decreased their average grain sizes. The partially V5+-substituted α-Fe2O3 phase and Fe3+-substituted V2O5 could be the important intermediate phases in the production of FeVO4 single phase. In addition, xV2O3·(1-x)α-Fe2O3 (x = 0.1, 0.3, 0.5, and 0.7) solid solutions were successfully synthesized by mechanochemical activation of V2O3 and α-Fe2O3 mixtures. Complete solid solutions exist after 12 h ball-milling time for all studied x values. The synthesized xV2O3·(1-x)α-Fe2O3 solid solutions with x = 0.5 and 0.7 were mainly paramagnetic at room temperature. The study demonstrates that the transformation pathway is related to the valence state of the metallic specie of the oxide used in connection with hematite.

Keywords

magnetic propertiesmechanical alloyingMössbauer effect
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1494: Symposium Z – Oxide Semiconductors and Thin Films , 2013 , pp. 185 - 190
Copyright
Copyright © Materials Research Society 2013 

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References

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