Abstract

A series of nanocrystalline Fe1−x2+Znx2+Fe23+O42− powder has been synthesized by co-precipitation method followed by heat treatment in an autoclave reactor. Identifying and structural characterization of samples have been carried out by using X-ray diffraction. The results demonstrated that all samples have spinel structure and the zinc ions engaged within spinal structure. As well as it reveal that the pure single phase have been obtained. FE-SEM images had revealed that all samples have homogeneous spherical shape with narrow distribution of the particles size (~20nm). Zinc effect on structure and magnetic properties for the prepared nanoparticles was studied. Moreover the heating efficiency and superparamagnets properties of ferrofluids samples were investigated. Magnetic measurements performed at room temperature by using vibrating sample magnetometer (VSM). Both type of samples; condensed nanoparticle (bulk) and nanoparticles that dispersed in paraffin wax showed negligible coercivity and remanent magnetization. As it revealed presence of unblocked superparamagnetic nanoparticles in the samples. Significant variation of saturation magnetization was noticed by change zinc content in the structure, and highest value has gained at x=0.5. Then saturation magnetization gradually decreased with increase zinc content. Effect of interparticle interaction on magnetization had reflected through comparing magnetization of same sample in form ferrofluid and bulk. It demonstrated that the domain magnetization Md of non-interacting magnetic nanoparticles is greater about 10 times than bulk magnetization MB at room temperature. Heating efficiency of water based ferrofluids samples carried out through hyperthermia experiments. It tested under an alternating magnetic field 6.5 kA/m and frequency 270 KHz, the results showed that the intrinsic loss power (ILP) had doubled at x=0.3 as compared with magnetite.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.