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Mechanochemical Synthesis of Novel Sensor Materials

Published online by Cambridge University Press:  31 January 2011

Monica Sorescu ,
Lucian Diamandescu  and
Adelina Tomescu
Monica Sorescu
Affiliation:
sorescu@duq.edu, Duquesne University, Physics, 600 Forbes Avenue, 211 Bayer Center, Pittsburgh, Pennsylvania, 15282-0321, United States, 412-396-4166, 412-396-4829
Lucian Diamandescu
Affiliation:
ldiamandescu@gmail.com, National Institute of Materials Physics, Bucharest, Romania
Adelina Tomescu
Affiliation:
tade@infim.ro, National Institute of Materials Physics, Bucharest, Romania
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Abstract

The xZnO-(1-x)alpha-Fe2O3 and xZrO2-(1-x)alpha-Fe2O3 nanoparticles systems have been obtained by mechanochemical activation for x=0.1, 0.3 and 0.5 and for ball milling times ranging from 2 to 24 hours. Structural and magnetic characteristics of the zinc and zirconium-doped hematite systems were investigated by X-ray diffraction (XRD), Mössbauer spectroscopy and conductivity measurements. Using the dual absorber method, the recoilless fraction was derived as function of ball milling time for each value of the molar concentration involved. As ZnO is not soluble in hematite in the bulk form, the present study clearly illustrates that the solubility limits of an immiscible system can be extended beyond the limits in the solid state by mechanochemical activation. Moreover, this synthetic route allowed us to reach nanometric particle dimensions, which makes these materials very important for gas sensing applications.

Keywords

magnetic propertiesceramicmechanical alloying
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1226: Symposium II – Mechanochemistry in Materials Science , 2009 , 1226-II04-05
Copyright
Copyright © Materials Research Society 2010

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