Rietveld refinement, morphology and superparamagnetism of nanocrystalline Ni0.70−xCuxZn0.30Fe2O4 spinel ferrite

Cation distribution, magnetic and hyperfine interaction studies of Ni–Zn spinel ferrites: role of Jahn Teller ion (Cu2+) substitution

“…A similar result is reported for spinel ferrite materials. 24 The values of the average particle size deduced from the TEM images are in the range of 24-45 nm. The SAED patterns show diffraction rings corresponding to the spinel-cubic lattice.…”

Magnetic Attributes of NiFe2O4 Nanoparticles: Influence of Dysprosium Ions (Dy3+) Substitution

“…It is reported in the literature that the manifestation of a peak in the M ZFC (T) plots is associated to the blocking temperature ( T B ) [22]. The curves of M ZFC (T) of the prepared products showed an incomplete maximum or broad maximum at around the temperature noted T B .…”

“…Therefore, the variations in blocking temperature with substitution effects are not predominantly influenced by the grain size. Thus, in addition to the particle size effect, the T B could also be affected by numerous other extrinsic factors, mostly related to interactions among particles and intrinsic factors that principally include a magneto–crystalline, surface and shape anisotropy [22,25]. We noticed in the synthesized product with x = 0.03 that the M ZFC ( T ) exhibits a breaking at temperatures indicated by the dashed circle in Figure 5.…”

Observation of dielectric dispersion and relaxation behavior in Ni2+-substituted cobalt ferrite nanoparticles

“…[1][2][3][4][5][6] In the field of microwave instruments, because of their nonlinear phenomenological properties they have been applied as phase shifters, circulators and isolators. 7 For instance, the spinel ferrite AB 2 O 4 (A = Co, Ni, Zn, Mn, Li and Mg; B = Fe) exhibits a cubic structure with the space group Fd% 3m, where A is termed the tetrahedral site, B is denominated as the octahedral site, and oxygen atoms are located at the cubic close-packed arrangement. Cobalt ferrite has also drawn interest from the scientific community due to its remarkable magnetic, optical and electrical properties and potential technological applications.…”