Structural, Optical, and Magnetic Characterization of Spinel Zinc Chromite Nanocrystallines Synthesised by Thermal Treatment Method

Journal of Nanomaterials - Tập 2014 Số 1 - 2014
Salahudeen A. Gene1,2, Elias Saion2, Abdul Halim Shaari2, Mazliana Ahmad Kamarudin2, Naif Mohammed Al‐Hada2, Alireza Kharazmi2
1Department of Physics, Faculty of Applied Science and Technology, Ibrahim Badamasi Babangida University, Lapai 234066
2Department of Physics, Faculty of Science, University Putra Malaysia (UPM), 43400 Serdang, Selangor

Tóm tắt

The present study reports the structural and magnetic characterization of spinel zinc chromite (ZnCr2O4) nanocrystallines synthesized by thermal treatment method. The samples were calcined at different temperatures in the range of 773 to 973 K. Polyvinylpyrrolidone was used to control the agglomeration of the nanoparticles. The average particle size of the synthesized nanocrystals was determined by powder X‐ray diffraction which shows that the crystallite size increases from 19 nm at 773 K to 24 nm at 973 K and the result was in good agreement with the transmission electron microscopy images. The elemental composition of the samples was determined by energy dispersed X‐ray spectroscopy which confirmed the presence of Zn, Cr, and O in the final products. Fourier transform infrared spectroscopy also confirmed the presence of metal oxide bands for all the samples calcined at different temperature. The band gap energy was calculated from UV‐vis reflectance spectra using the Kubelka‐Munk function and the band gap energy of the samples was found to decrease from 4.03 eV at 773 K to 3.89 eV at 973 K. The magnetic properties were also demonstrated by electron spin resonance spectroscopy, the presence of unpaired electrons was confirmed, and the resonant magnetic field and the g‐factor of the calcined samples were also studied.

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Journal of Nanomaterials

Tập 2014 Số 1

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