Cobalt doping on nickel ferrite nanocrystals enhances the micro-structural and magnetic properties: Shows a correlation between them

Structural characteristics, cation distribution, and elastic properties of Cr3+ substituted stoichiometric and non-stoichiometric cobalt ferrites

“…To determine true value of lattice parameter ( a true ) from XRD data, Nelson–Riley (N–R) extrapolating function ( eqn (A2) ) has been used. 17 The lattice parameter for each Bragg position has been calculated using eqn (A3) . The N–R function vs. a hkl graph has been plotted for each sample which is shown in Fig.…”

“…In this method, higher angle reflections are less important than lower angle reflections. In the SSP method, the following relation has been considered: 17 Here, d hkl is lattice spacing for different ( hkl ) planes. The ( d hkl β hkl cos θ ) 2 are plotted as a function of d hkl 2 β hkl cos θ and their linear fitted curve have been drawn using the origin software as shown in Fig.…”

“…As such, Williamson-Hall method has been utilized to calculate both D and the strain, 3 of the materials. According to this method, a total physical broadening, b tot , have been calculated by the following relation: 14,17…”

The impact of cation distribution on the structural and magnetic properties of nonstoichiometric Co0.5Ni0.5+xFe2−xO4 nanoferrites

“…As mentioned before, the presence of more Fe 3+ cations in the octahedral sites is expected to enhance the crystallite growth. For this reason, cobalt ferrite particles are generally larger in size than nickel ferrite prepared under the same conditions [24,30,40,60]. Figure 11 illustrates both the occupation ratio of Fe 3+ cations (Fe B/A 3+ = Fe B 3+ /Fe A 3+ ) and the crystallite size for the recent samples, which confirms the direct correlation between D and the relative accumulation of Fe 3+ cations in the octahedral side.…”

Influence of Magnetite Nanoparticles Shape and Spontaneous Surface Oxidation on the Electron Transport Mechanism

“…As one can see, all patterns can be very well described using Miller indices characteristic to the magnetite phase (Fd-3m; a = b = c = 0.8375 nm; α = β = γ = 90°). Based on the measured XRD patterns, average crystallite size and intrinsic strain were calculated using the Halder–Wagner method, which was previously used to determine the size of crystallites of magnetite and other ferrites [ 22 , 23 , 24 ]. Intrinsic strain in nanomaterials is prevalent and can be determined by analyzing the broadening of diffraction peaks.…”