Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties.
tawfik, E., Eisa, W., Okasha, N., ashry, H. (2020). Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties.. EKB Journal Management System, 37(Part 1 (Basic Sciences)), 73-91. doi: 10.21608/jsrs.2020.129917
eman tawfik; Wael H. Eisa; N. Okasha; H.A. ashry. "Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties.". EKB Journal Management System, 37, Part 1 (Basic Sciences), 2020, 73-91. doi: 10.21608/jsrs.2020.129917
tawfik, E., Eisa, W., Okasha, N., ashry, H. (2020). 'Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties.', EKB Journal Management System, 37(Part 1 (Basic Sciences)), pp. 73-91. doi: 10.21608/jsrs.2020.129917
tawfik, E., Eisa, W., Okasha, N., ashry, H. Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties.. EKB Journal Management System, 2020; 37(Part 1 (Basic Sciences)): 73-91. doi: 10.21608/jsrs.2020.129917

Influence of annealing temperature of α- Fe2O3 nanoparticles on Structure and Optical Properties.

Journal of Scientific Research in Science
Article 6, Volume 37, Part 1 (Basic Sciences), February 2020, Page 73-91  XML PDF (2.39 MB)
Document Type: Original Article
DOI: 10.21608/jsrs.2020.129917
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Authors
eman tawfik email 1; Wael H. Eisa2; N. Okasha3; H.A. ashry1
1Radiation Physics Department, National Centre for Radiation Research and Technology(NCRT), Atomic Energy Authority (AEA), Nasr City, Cairo, Egypt.
2Spectroscopy Department, Physics Division, National Research Centre (NRC), Egypt.
3Physics Department, Faculty of Women, Ain Shams University, Cairo, Egypt.
Abstract
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 andits 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.
Keywords
Hematite; XRD; EDS; SEM; Strain; Optical properties
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