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Tin-Doped Hematite Nanoparticles for Gas-Sensing Applications

Published online by Cambridge University Press:  01 February 2011

Monica Sorescu ,
Lucian Diamandescu  and
Doina Tarabasanu-Mihaila
Monica Sorescu
Affiliation:
[email protected], Duquesne University, Physics, 600 Forbes Avenue, Pittsburgh, PA, 15282-0321, United States, (412) 396-4166, (412) 396-4829
Lucian Diamandescu
Affiliation:
[email protected], National Institute for Materials Physics, Materials Science, Romania
Doina Tarabasanu-Mihaila
Affiliation:
[email protected], National Institute for Materials Physics, Materials Science, Romania
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Abstract

Structural and morphological characteristics of (1-x)α-Fe2O3-xSnO2 (x=0.0-1.0) nanoparticles obtained under hydrothermal conditions have been investigated by X-ray diffraction (XRD) and Mössbauer spectroscopy. On the basis of the Rietveld structure refinements of the XRD spectra at low tin content, it was found that Sn4+ partially substitutes for Fe3+ at the octahedral sites. The mean particle dimension decreases from 70 to 6 nm as the molar fraction x increases. The estimated solubility limits in the system of tin-doped hematite nanoparticles synthesized under hydrothermal conditions are x<0.2 for Sn4+ in α-Fe2O3 and x>0.7 for Fe3+ in SnO2.

Keywords

chemical synthesishydrothermalMössbauer effect
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O05-03
Copyright
Copyright © Materials Research Society 2006

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References

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