Structural and magnetic properties of Co1+ySnyFe2-2y-xCrxO4 ferrite system

Abstract

The samples of the series Co 1+y Sn y Fe 2-2y-x Cr x O 4 ferrites with x = 0⋅ ⋅0, 0⋅ ⋅1, 0⋅ ⋅2, 0⋅ ⋅3, 0⋅ ⋅4, 0⋅ ⋅5 and y = 0⋅ ⋅05, were prepared by the usual double sintering ceramic technique. The single-phase spinel structure of the samples was confirmed by using X-ray diffractometry technique. The lattice parameter 'a' with an accuracy of ± ± 0⋅ ⋅002 Å were determined using Bragg peaks of XRD pattern. The lattice parameter 'a' decreases with concentration, x, which is due to the difference in the ionic radii of Cr 3+ and Fe 3+ ions. The X-ray intensity calculations were carried out in order to determine the possible cation distribution amongst tetrahedral (A) and octahedral [B] sites. The X-ray intensity calculations show Cr 3+ ions occupying B site. The saturation magnetization, σ σ s , and magneton number, n B (the saturation magnetization per formula unit), measured at 300 K determined from high field hysteresis loop technique decrease with increase in concentration, x, suggesting a decrease in ferrimagnetic behaviour. Thermal variation of low field a.c. susceptibility measurements from room temperature to about 800 K exhibits almost normal ferrimagnetic behaviour and the Curie temperature, T C determined from a.c. susceptibility data decreases with increase in x.

Electrical and magnetic properties of Cr3+ substituted nanocrystalline nickel ferrite

“…A similar type of behavior for Cr 3+ substituted ferrite system is reported in literature. 18,19 The average particle size was determined from the measured width of diffraction pattern using Scherrer formula…”

Effect of nickel substitutions on some properties of Cu–Zn ferrites

“…It is evident from Table 1 that, the increase in Ni content causes a lowering in grain size. Pandit et al [18] concluded that the replacement of Fe with Cr +3 in Co-Sn ferrite leads to a decrease in cation vacancies and in turn to a decrease of grain size.…”

Characterization and Magnetic Properties of Nanoparticle Ni1−x Zn x Fe2O4 Ferrites Prepared Using Microwave Assisted Combustion Method

“…The crystallite size of the nanocrystalline samples were calculated using the Debye-Scherrer formula given in Eq. (1).…”

“…[1]. Among the soft ferrites, Ni-Zn ferrites are of commercial importance due to their high frequency applications in different devices such as radio frequency coils, transformer cores, etc.…”