Crystal structure, microstructure, optical, dielectric, and magnetic properties of TiO2 nanoparticles
Tóm tắt
In this present work, titanium dioxide (TiO2) nanoparticles were prepared by a standard solid-state reaction technique. The structural analysis by the XRD pattern confirms a single rutile phase tetragonal structure. According to scanning electron microscopy analysis, the prepared sample shows uniform morphology with a mean particle size of 120–160 nm. The elemental analyses by energy dispersive spectroscopy confirm the absence of any impurity in the prepared sample. The UV–vis absorption data reveal that the band gap value of the synthesized compound was found to be 2.94 eV. From the optical transmittance spectrum, the average transmittance of the prepared sample in the visible range was found to be 55%. The field and temperature dependence of magnetization reveals a weak ferromagnetic behavior, with saturation magnetization of 0.002 µB and coercivity of 930 Oe. Most likely, the presence of defects and/or oxygen vacancies is thought to be responsible for this particular behavior. Dielectric properties observations reveal that the sample exhibits low dielectric loss in the higher frequency region, which is compatible with the Maxwell and Wagner model.
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