Magnetic properties of nickel–zinc ferrite nanoparticles synthesized by coprecipitation

Abstract

The influence of Zn substitution in the magnetic properties of a nanoscale system Ni1–x Znx Fe2O4 (where x = 0.0, 0.25, 0.50 and 0.75) was studied. The ferrites were synthesized by the coprecipitation technique. Transmission electron microscopy revealed a particle size around 4–15 nm, increasing with Zn content. FC/ZFC curves showed a typical superparamagnetic behavior in all samples. It was found that Zn substitution affects both the blocking temperature and the magnetization. The maximum magnetization at room temperature was 48 emu/g for the sample x = 0.50. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Effect of heat treatment on the magnetic properties of nanocrystalline spinel Li–Ni ferrite prepared by a simple soft chemistry route

“…It is known that the properties of ferrite particles are influenced by the composition and microstructure, which are sensitive to the preparation methodology used in their synthesis. To date, many methods have been used for the preparation of nanocrystalline soft ferrite including sol-gel [10], co-precipitation [11], solvothermal [12], combustion [13], mechano-chemical [14], refluxing [15] and microemulsion method [16]. Recently, a rheological phase reaction method has attracted much attention due to its inherent advantages of low-processing temperature and homogeneous reactant distribution.…”

Synthesis and Characterization of Ni-Zn Ferrite Nanoparticles (Ni<sub>0.25</sub>Zn<sub>0.75</sub>Fe<sub>2</sub>O<sub>4</sub>) by Thermal Treatment Method

“…Thus it is possible to control particle size by the calcination temperature. Smaller particle size has been reported for Ni 0.25 Zn 0.75 Fe 2 O 4 nanoparticles prepared by wet co-precipitation routes with the average particle size of about 4 nm [21] and 7 nm for Ni 0.3 Zn 0.7 Fe 2 O 4 prepared by co-precipitating aqueous solutions in alkaline medium [6]. By ball-milling on Ni 0.2 Zn 0.8 Fe 2 O 4 nanoparticles fabricated by mechanochemical method, particle size of about 11 nm was obtained but following annealing at 773 K the particle size increased to about 26 nm [22].…”

Synthesis and characterization of low-density porous Ni 0.55Zn0.25Cu0.20Fe2O4 (NZCFO) by sol-gel auto-combustion method

“…A promising strategy to reduce electromagnetic pollution of human habitats is utilized by electromagnetic protection technology in building materials to reduce the electromagnetic impact. Ni-Zn-Cu ferrite (Ni x Zn 1-x-y Cu y Fe 2 O 4 , NZCFO) has become one of the leading materials used for soft magnetic and microwave absorbing applications due to its high saturation magnetization, high resistivity, low coercive force, low preparation cost, and good absorbing performance [2][3][4][5][6][7][8][9][10][11].…”

“…NZCFO could be synthesized by several methods, such as sol-gel method [2], laser deposition [3], co-precipitation [4,5], auto-combustion [6], hydrothermal method [7], ball milling [8], precursor method [9], microemulsion technique [10], and ultrasonic cavitation [11]. As one of the most widely used building materials, sol gel had been prepared in combination with ferrite materials.…”