Abstract
The synthesis of a high value-added product, gahnite ferroan nano composite, from a mixture of fly ash silica and ZnO is a low-cost and non-expensive technique. The XRD pattern clearly reveals the synthesized product from fly ash after leaching is a product of high-purity gahnite ferroan composite. The grains are mostly cubical in shape. The optical band gap of powdered gahnite ferroan nano composite is 3.37 eV, which acts as a UV protector. However, the bulk sample shows that the 500 to 700 nm wavelength of visible light is absorbed, and UV light is allowed to pass through. So, the bulk sample acts as a band pass filter of UV light which can be used in many optical applications for conducting UV-irradiation activity. Dielectric permittivity and dielectric loss increase with a rise in temperature. The increase in the ac conductivity at higher temperatures denotes the negative temperature coefficient resistance (NTCR) behavior of the material.
Highlights
Gahnite ferroan, (Zn,Fe)Al2 O4, is a mineral present in small amounts in rock but has no bearing on the classification of the rock, similar to zircon in granite
The gahnite ferroan nano composite has been successfully synthesized by chemical techniques followed by a solid-state reaction route, to a high-purity material confirmed by JCPDS #
The nano powder obstructs UV light, whereas the bulk form of the sample acts as a band pass filter for UV light
Summary
Gahnite ferroan, (Zn,Fe)Al2 O4 , is a mineral present in small amounts in rock but has no bearing on the classification of the rock, similar to zircon in granite. Parelhas (Rio Grande do Norte, Brazil), Wodgina and Greenbushes (Western Australia), Victoria Range (Nelson, New Zealand) and the Mamandur area (Tamil Nadu, India) Due to globalization, these rare minerals are in the last stage of vanishing. These rare minerals are in the last stage of vanishing Recreating this type of mineral for different applications is the prime objective of this research work, by implementing the waste management techniques to form value-added products such as gahnite ferroan. A wide variety of compounds are found in the composition of FA, including silicon dioxide (SiO2 ), aluminum oxide (Al2 O3 ) and iron oxide (Fe2 O3 ) Elements such as manganese (Mn), zinc (Zn), nickel (Ni), lead (Pa) and arsenic (As) are found predominantly in different forms of fly ash, depending on the production method. Structural, morphological, optical and electrical characterizations are carried out to confirm the formation and different properties of gahnite ferroan
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