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Characterization of nanostructured magnetite thin films produced by sol–gel processing

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Abstract

Nanocrystalline films of magnetite have been prepared by a novel sol–gel route in which, a solution of iron (III) nitrate dissolved in ethylene glycol was applied on glass substrates by spin coating. Coating solution showed Newtonian behaviour and viscosity was found as 0.0215 Pa.s. Annealing temperature was selected between 291 and 350 °C by DTA analysis in order to obtain magnetite films. In-plane grazing angle XRD and TEM studies showed that magnetite phase was present upon annealing the films at 300 °C. The films had crack free surfaces and their thicknesses varied between ~10 and 200 nm. UV–Vis spectrum results showed that transmittance of the films increases with decreasing annealing temperature and increasing spinning rate. Up to 96% transmittance was observed between the wavelengths of 900–1,100 nm. Vibrating sample magnetometer measurements indicated that magnetite thin films showed ferromagnetic behavior and the saturation magnetization value was found as ~35 emu/cm3.

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Acknowledgments

This work was supported by Middle East Technical University Research Fund through the project BAP-2006-07-02-00.01. DTA, viscosity, AFM and FESEM measurements were conducted at the Central Laboratory of Middle East Technical University. The authors would like to express their sincere thanks to Dr. Suleyman Tari (IYTE) for VSM work and Dr. Ozgur Duygulu (TUBITAK) for TEM work.

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  1. Department of Metallurgical and Material Engineering, Middle East Technical University, 06531, Ankara, Turkey

    Ali Erdem Eken & Macit Ozenbas

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  1. Ali Erdem Eken
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  2. Macit Ozenbas
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Correspondence to Macit Ozenbas.

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Eken, A.E., Ozenbas, M. Characterization of nanostructured magnetite thin films produced by sol–gel processing. J Sol-Gel Sci Technol 50, 321–327 (2009). https://doi.org/10.1007/s10971-009-1971-9

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