Extraction and characterization of highly pure alumina (α, γ, and θ) polymorphs from waste beverage cans: A viable waste management approach

Elucidation of structural, electromagnetic, and optical properties of Cu–Mg ferrite nanoparticles

“…The basic absorption, which corresponds to the value of the optical bandgap of the produced nanomaterials may be determined by excitation of electrons from the valence band to the conduction band [ 9 , 67 , 72 ].The optical direct band gap energy (Eg) is measured by drawing a graph ( Fig. 13 b-f) between [F(R)h ν ] 2 and h ν this is generally known as Tauc's relation [ 79 ]. The calculated values of direct band gaps of Mg 1-x Cu x Fe 2 O 4 (x = 0.0, 0.25,0.5, 0.75 and 1.00) nanoparticles are 1.77, 1.78, 1.90, 1.96 and 2.00 eV, respectively ( Fig.…”

Investigation of γ-Alumina Particle Size: The Role of Hydrogen Defects on Size Constraint

“…Experimental measurements − of γ-alumina report particle sizes of 0.008–1.6 μm, ,− with 80–90 Å being the typical range . The particles are so small that the material’s structure is difficult to characterize − using high-precision methods such as single-crystal X-ray diffraction.…”