Iron-Doped Titania for Magneto-Opto-Electronic Device Applications

Rehani, Divya; Saxena, Manish; Dhakate, Sanjay R.; Sharma, Shailesh Narain

doi:10.1007/s11664-023-10281-5

Cited by 3 publications

(1 citation statement)

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“…The band gap energy exhibited maximum values of optical conductivity at 300 nm for the slag composites, as shown in Table 3 The optimum value for optical conductivity was 2.1 × 10 6 s −1 for the slag composite annealed at 600 • C and at a wavelength of 300 nm due to the increase in the energy states. These results give insight into the optical properties of disordered slag composite samples and their potential use as a component in energy conversion applications, storage, and optical devices [48,49].…”

Section: Optical Propertiesmentioning

confidence: 90%

Morphological, Structural, and Optical Features of Thermally Annealed Slag Powders Generated from the Iron and Steel Industry: A Source of Disordered Iron Oxide Composites

Saeedi,

Almarri,

Alabdallah

et al. 2023

Crystals

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Steel slag waste produced by the steel industry accumulates in open areas or is disposed of in landfills, causing harm to the environment and human health. Valorizing steel slag through comprehensive data analysis is imperative and could add value to the product with respect to energy conversion and storage applications. This study investigated the morphological, structural, and optical characteristics of a thermally annealed steel slag composite generated from iron and steel factories. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Raman spectroscopy, and UV–visible spectrophotometry were subsequently used to evaluate the impact of thermal treatment on the morphology, structure, elemental composition, and optical properties. It was found that the pre-treated slag composites contained a variety of irregular grain sizes and microscale fragments, primarily composed of C (18.55%), O (50.85%), and Fe (29.41%), with lower amounts of Mg (0.31%), Si (0.44%), and Ca (0.44%), indicating the natural formation of a disordered iron composite. Thermal treatment at different temperatures (300 °C, 600 °C, and 900 °C) increased the grain density and clustering, resulting in denser two-dimensional microstructures at 900 °C. Additionally, XRD and Raman analyses of both untreated and thermally treated slag composites revealed the presence of a disordered iron oxide composite, including (Fe3O4), hematite (α-Fe2O3), and maghemite (γ-Fe2O3) phases. A significant increase in optical absorbance was also observed after annealing at 600 °C, highlighting the successful optimization of the elemental composition of the slag composite. A band gap energy of approximately 2.2 eV was obtained from this optimization at 600 °C. The optical conductivity of the composite reached 2.1 × 106 S−1 at 600 °C, which indicates an enhancement in charge transfer among the optimized chemical elements in the waste composite. These findings suggest an optimization method for novel composites derived from steel slag waste, indicating its potential as a low-cost material for energy storage systems (batteries, supercapacitors, and fuel cells) and optoelectronic devices.

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Section: Optical Propertiesmentioning

confidence: 90%