Investigation of structural and magnetic properties of co-precipitated Mn–Ni ferrite nanoparticles in the presence of α-Fe2O3 phase

In-Depth Understanding of the Morphology Effect of α-Fe2O3 on Catalytic Ethane Destruction

“…The Mössbauer spectrum of Fe 2 O 3 -S is well fitted with two sextets, and the spectra of Fe 2 O 3 -C and Fe 2 O 3 -R materials are well fitted with one sextet. The IS values of all samples listed in Table are lower than 0.5 mm s –1 , indicating that the valence state of iron in all catalysts is +3 . The sextets with Bhf around 51 T can be assigned to the characteristic of high-spin Fe 3+ ions in octahedral coordination of the α-Fe 2 O 3 phase (hematite) .…”

“…The IS values of all samples listed in Table 2 are lower than 0.5 mm s −1 , indicating that the valence state of iron in all catalysts is +3. 29 The sextets with Bhf around 51 T can be assigned to the characteristic of high-spin Fe 3+ ions in octahedral coordination of the α-Fe 2 O 3 phase (hematite). 30 The roomtemperature existence of a doublet in the Mossbauer spectrum is related to the presence of superparamagnetic nanoparticles, which have critically lower dimension based on the results of XRD (Figure 2A).…”

Structural and FTIR Spectroscopic Studies of Mg-Zn Ferrite Nanoparticles Synthesized by Co-Precipitation Technique

“…The crystallite size decreases with increase of Mg 2+ ion concentration, resulting in the increase of lattice strain. The variations in lattice parameter and crystallite size follow the Vegard's law [19] as shown in Fig 2. It was observed that the experimental density decreases with increase of Mg 2+ ion concentration. The variation of experimental density depends upon molecular weight of ferrite in spite of decrease in lattice parameter.…”

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

“…It is also evident that all the reflection peaks are intense and sharp without any impurity peaks thus, the materials are single phase in nature. The average particle size (t) of the Gd 3+ substituted Ni-Co ferrite powders was determined by utilizing the most intense peak (311) and by means of the Debye-Scherer's formula [47,48], where λ is wavelength of the 'Cu-Kα' radiation, β is the full width of the half maximum, θ is Bragg's angle. The average particle size assessed by using Debye-Scherer's formula is of the order of 29-35 nm showing nano-regime dimension ( Table 1).…”