Enhancement of the magnetic properties of Ni–Cu–Zn ferrites by the non-magnetic Al3+-ions substitution

Structural and magnetic properties of nano-sized NiCuZn ferrites synthesized by co-precipitation method with ultrasound irradiation

“…As it can be seen from this figure that FTIR spectra of the investigated samples exhibit two absorption bands around 400 and 600 cm -1 . These bands are characteristic of spinel ferrites and attributed to the vibrations of the metal ion-oxygen complexes in the tetrahedral and octahedral sites [10]. The high frequency band appearing near 600 cm -1 was attributed to stretching mode of tetrahedral group (noted  1 ) and that lower band near the 420 cm -1 was assigned to octahedral cluster.…”

“… Nanopowders of Ni 0.4 Cu 0.2 Zn 0.4 Fe 2 O 4 were prepared by citrate precursor method followed by sintering at lower temperature [9].  Conventional solid state reaction oxide method and calcination at higher temperature was also used to prepare nanopowders of this ferrite [10].…”

Structural and magnetic properties of Ni0.15Mg0.1Cu0.3Zn0.45Fe2O4 ferrite prepared by NaOH-precipitation method

“…It can be also noticed that there are abrupt falls of i near T c , which reflects the homogeneity of the samples. For all the samples, the Curie temperature (shown in Table 2) is invariant generally because it is determined by the chemical component and lattice structure [30]. For applications, the temperature dependence of permeability is very important.…”

Effect on structural and magnetic properties of aluminum substitutedNi–Znnanoferrite system prepared via citrate-gel route

“…Another study shows that spin canting at octahedral B sites due to the presence of nonmagnetic ions is also responsible for the decrease in magnetization. 47 …”