Influence of Cu Substitution on Physical Properties of Co-Zn Ferrite Nanoparticles

Abstract

In this work, influence of Cu substitution on structural and magnetic properties of Cobalt-Zinc ferrite nanoparticles synthesized by sol-gel combustion method have been investigated. All the samples exhibit cubic spinel structure and the lattice constant decreases linearly with increasing Cu-content. Average crystallite sizes calculated from Debye-Scherrer formula are in the range of 51-100nm. Cation distribution estimated form X-ray line intensity calculations show that Cu ions simultaneously occupy tetrahedral (A) and octahedral (B) sites with different ratio and Zn and Co ions occupies A and B sites respectively. With increasing Cu content a fraction of Co ions migrate to A site when x>0.2. Saturation magnetization (Ms), Coercivity (Hc) and remanent magnetization (Mr) that varies significantly with Cu-Content. Saturation magnetization decreases from 90.7 emu/g (x=0.0) to 51 emu/g (x=0.4). The proposed cation distribution supports the variation in saturation magnetization and Coercivity with increasing Cu content.

Effect of Mn2+ Substitution on Structural and Magnetic Properties of Co-Zn Ferrite

“…6 According to XRD reference card (JCPDC card no.22-1086) for CoFe 2 O 4 , XRD peaks were indexed with their Miller indices as (220), (311), (400), ( 422), (511), and (440). 1,4,6 The pattern confirms the formation of single-phase spinel structure as a major phase without any peaks belong to internal stress and a small minor phase indicated by (*) but with very small intensity. Well-defined sharp diffraction lines were observed in the samples, that proved the good crystallization without any impurities.…”

“…Spinel ferrites are chemical and magnetic materials that have diverse applications in various fields such as electrical, magnetic, electronic, and microwave devices, catalytic converters, and transformers. 1,2 The effective factors that affect the physical properties of the ferrites are their chemical composition, method of preparation, particle's size and their microstructure. 1 The spinel ferrite has a cubic structure, it exhibits an Fd-3m space group.…”

“…1,2 The effective factors that affect the physical properties of the ferrites are their chemical composition, method of preparation, particle's size and their microstructure. 1 The spinel ferrite has a cubic structure, it exhibits an Fd-3m space group. 2 Among the spinel ferrites, the Co-Zn ferrites have attracted considerable attention.…”

“…The properties of Co-Zn ferrites can be improved by adding a suitable dopant and applying an appropriate synthesis method. 1 Manganese doped spinel cobalt ferrites were prepared by sol-gel method. It has been reported that the average crystallite size was increased from 10.79 to 14.18 nm by increasing Mn 2+ content from (0.2 to 0.6) then decreased.…”

Properties of Cu-xFe3O4 Nanocomposites for Electrical Application

“…Measuring the saturation levels and coercivity from the hysteresis loop, the characteristics of the magnetization curves of the two nanocomposite samples are presented in Table 6 along with a standard sample. The saturation magnetization value of the standard sample is 55 emu/g, lower than that of bulk magnetite, which is 90.7 emu/g [16]. Superparamagnetic behavior is explained by the fact that particles manifest in the external magnetic field, as magnetic entities that interact only with the field and do not interact with each other [17].…”