Dependence of magnetic properties on crystallite size of CoFe₂O₄nanoparticles synthesised by auto-combustion method

Abstract

Cobalt ferrite (CoFe 2 O 4 ) nanoparticles were prepared through an auto-combustion method. The results of XRD show that the crystallite size of CoFe 2 O 4 nanoparticles increases from 57 to 105 nm with a slight change in lattice constant as the annealing temperature increases from 300 to 1200 C. The magnetic measurements by vibrating sample magnetometer (VSM) show that M s increases monotonously by increasing the annealing temperature from 300 to 1200 C and C hB and M s reached a maximum when annealing temperature is about 400 C due to the change of the grain size.

Synthesis and magnetic properties of hard magnetic (CoFe2O4)–soft magnetic (Fe3O4) nano-composite ceramics by SPS technology

“…Cobalt nitrate (Co(NO 3 Á H 2 O into 300 mL distilled water. The precursor was obtained by heating the solution till the occurrence of combustion, which was followed by the annealing treatment in air at 400 1C for 4 h (previous work has shown that CoFe 2 O 4 prepared through this method has the maximum coercivity) [22]. The soft ferrite, Fe 3 O 4 used for the composite, was of analytical grade and was procured commercially (Sinopharm Chemical Reagent Co., Ltd.).…”

Influence of calcination temperature on Cd0.3Co0.7Fe2O4 nanoparticles: Structural, thermal and magnetic properties

“…The band observed at 1635 cm À 1 in both samples is assigned to the stretching and bending vibration of the H-O-H bond respectively [53,54]. This shows the physical adsorption of H 2 O on the surfaces.…”

Taguchi robust design to optimize synthesis of lead oxalate nano-disks

“…Therefore, investigations on the synthesis procedures of inorganic salts such as lead oxalate nanoparticles are necessary to produce their powders with controlled particle size, shape, and size distribution [8,9]. Several methods currently have been applied to synthesize inorganic salts nanoparticles such as hydrothermal synthesis [10,11], chemical precipitation [12], template synthesis [13,14], sol-gel [15], emulsion system [16], combustion technique [17], micronization via supercritical fluids technology [18,19], electrochemical processes [20,21], and ultrasonic assisted synthesis [22]. Among these methods, in this study, the chemical precipitation method with a semi-batch reactor was used; because this technique is relatively simple to obtain the particles in powder form and allows us to control the morphology of the product particles [23,24].…”