On the structural, refractive index and energy bandgap based optical properties of Lithium ferrite nanoparticles dispersed in silica matrix

A Study on Fine-Tuning the Optical Energy Band Gap and Various Optical Parameters with the Impact of Gadolinium Composition in NGFO Ferrite Nanoparticles

“…It is predicted that, for our the Moss relation gives better results which would in good concordance with values from the experiment. Similar to our study, Bardapurkar et al, have calculated refractive index of lithium ferrite samples from the material density and also reported the comparative study with various empirical relations for calculations of refractive index of the material [35]. Liya Zhukova et al, have determined the refractive index for Ag 1−𝑥 Tl 𝑥 Br 1−0.54𝑥 I 0.54𝑥 crystals and scrutinized refractive index empirical calculations, with preferable Moss relation [25].…”

Comparison of optical absorption and diffuse reflectance spectra techniques for determining the optical energy band gap of dried and calcined Ni0.5Mn0.5Fe2O4 nanoferrite

“…OAS probes the electronic transitions in the individual nanoparticles suspended in the ferrofluid, while ODRS probes the collective optical properties of the dried powder, which may include effects from particle-particle interactions and agglomeration (i.e. Density of Metallic Cations (DMCs) [30,31]).…”

“…Crucially, the calcination process increased the crystalline size of the nanoparticles (Powder 600) to approximately 7 nm, compared to around 4 nm for (Powder 100). This increase in crystalline size is a significant factor contributing to the decreased energy band gap observed in the calcined Powder 600 relative to the Powder 100, as larger crystalline sizes are known to reduce the energy band gap [9,30].…”

“…In other words, the higher energy band gap value for the FF sample may be attributed to the suppression effect of the density of metallic cations (DMCs). In the Powder 100 sample (the authentic sample), the high DMCs facilitate the presence of numerous free electrons within the crystal lattice [30,31]. When light strikes the sample, the free electrons absorb energy, increasing their kinetic energy and enabling their transition to the conduction band, resulting in enhanced current flow through the material and consequently reducing the energy band gap [30].…”

“…In the Powder 100 sample (the authentic sample), the high DMCs facilitate the presence of numerous free electrons within the crystal lattice [30,31]. When light strikes the sample, the free electrons absorb energy, increasing their kinetic energy and enabling their transition to the conduction band, resulting in enhanced current flow through the material and consequently reducing the energy band gap [30]. However, when the Powder 100 sample is dispersed in water to form the FF, the density of the Powder 100 is suppressed, leading to a reduction in the number of free electrons within the lattice.…”