Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties
This work has been focused on the synthesis of the raw materials iron oxide nanoparticles; hematite (α -Fe2O3) from Iron (II) chloride tetra hydrate (FeCl2-4H2O) and iron (III) chloride hexahydrate (FeCl3-6H2O) using Solid State Chemical Reaction technique. Nanostructure powders were characterized...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Ain Shams University, Faculty of Women for Arts, Science & Education
2020-12-01
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| Series: | Journal of Scientific Research in Science |
| Subjects: | |
| Online Access: | https://jsrs.journals.ekb.eg/article_129917.html |
| Summary: | This work has been focused on the synthesis of the raw materials iron oxide nanoparticles; hematite (α -Fe2O3) from Iron (II) chloride tetra hydrate (FeCl2-4H2O) and iron (III) chloride hexahydrate (FeCl3-6H2O) using Solid State Chemical Reaction technique. Nanostructure powders were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), and UV-visible spectroscopy. XRD confirmed the formation of crystalline α -Fe2O3 nanostructured and its average crystallite size increased from ~ 12 to 28 nm with increasing annealing temperature from 200 up to 80℃ while SEM confirmed the morphology and the purity of the sample was evaluated from the energy dispersive spectrum (EDS). Moreover, strain decreased with increasing annealing temperature. UV-visible characterization indicated the existence of both direct and indirect band gap in the samples. All The annealed samples showed the direct band gap at ~ 2.21 eV. However, the indirect band gap increased from 1.6 to 1.94 eV when the annealing temperature increased from 200 up to 700℃ and remained almost the same for sample annealed at 800℃. The observed values of optical band gaps were in close agreement with the reported values. Our results indicated that the annealing would give rise to a good crystalline α -Fe2O3 nanoparticles with reduced strain. |
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| ISSN: | 2356-8364 2356-8372 |