Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

Abstract

In the present work, we synthesized CoxZn1-xFe2O4 spinel ferrite nanoparticles (x= 0, 0.1, 0.2, 0.3 and 0.4) via the precipitation and hydrothermal-joint method. Structural parameters were cross-verified using X-ray powder diffraction (XRPD) and electron microscopy-based techniques. The magnetic parameters were determined by means of vibrating sample magnetometry. The as-synthesized CoxZn1-xFe2O4 nanoparticles exhibit high phase purity with a single-phase cubic spinel-type structure of Zn-ferrite. The microstructural parameters of the samples were estimated by XRD line profile analysis using the Williamson–Hall approach. The calculated grain sizes from XRPD analysis for the synthesized samples ranged from 8.3 to 11.4 nm. The electron microscopy analysis revealed that the constituents of all powder samples are spherical nanoparticles with proportions highly dependent on the Co doping ratio. The CoxZn1-xFe2O4 spinel ferrite system exhibits paramagnetic, superparamagnetic and weak ferromagnetic behavior at room temperature depending on the Co2+ doping ratio, while ferromagnetic ordering with a clear hysteresis loop is observed at low temperatures (5K). We concluded that replacing Zn2+ ions with Co2+ ions changes both the structural and magnetic properties of ZnFe2O4 nanoparticles.

A synthesis of polyethylene glycol (PEG)-coated magnetite Fe3O4 nanoparticles and their characteristics for enhancement of biosensor

“…figure 6, all magnetization curves are shaped S-like over an external magnetic field, which is a typical superparamagnetic material, with zero coercivity in the M-H plot. Zero coercivity occurred because there was no residual magnetism when the external magnetic field was removed [20,21]. The saturation magnetization (M s ) of Fe 3 O 4 nanoparticles decreased from 77.16 to 37.15 emu g −1 with the increased PEG weight from 0 to 50% [22,23].…”

Green Synthesis of AgNPs() Ultilizing Delonix Regia Extract as Anticancer and Antimicrobial Agents**

“…Nanomaterials have great importance because of their properties compared to the same element with a bulk form. Nanomaterial show many properties such as optical, biological, catalytic and magnetic properties that depend on the shape and size of nanoparticles [1,2] . Methods used to synthesis nanoparticle by chemical techniques are hazardous and high expenses for example, reduction in solutions, [3] chemical and photochemical reactions in reverse micelles, [4] thermal decomposition of silver compounds, [5] radiation assisted, [6] electrochemical, [7] sonochemical, [8] and microwave‐assisted process [9] .…”

“…Nanomaterial show many properties such as optical, biological, catalytic and magnetic properties that depend on the shape and size of nanoparticles. [1,2] Methods used to synthesis nanoparticle by chemical techniques are hazardous and high expenses for example, reduction in solutions, [3] chemical and photochemical reactions in reverse micelles, [4] thermal decomposition of silver compounds, [5] radiation assisted, [6] electrochemical, [7] sonochemical, [8] and microwave-assisted process. [9] Chemical synthesis methods lead to the presence of some toxic chemical absorbed on the surface that may have an adverse effect in the medical applications.…”

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“…Therefore, the saturation magnetization of nanoparticles is approximately 70.0 emu/g (Figure 6a) and is far less than its bulk counterparts (92.0 emu/g). [41][42][43][44] The nano-Fe 3 O 4 @Qs/Ni (II) magnetization was lower than 30.0 emu/g. .…”