Study of magnetic induction heating of Li0.25Zn0.3Co0.15Fe2.3O nanoparticles

Five different batches of Li0.25Zn0.3Co0.15Fe2.3O4 (LZC) nanoparticles were prepared by sol-gel method. Of these five batches, one has a very small mean size of-6.0 nm and the others have mean sizes of-11.9, 47.3, 114 and 139 nm. The phase formation of the nanoparticles is confirmed by analysing the X-ray diffraction (XRD) patterns using the Rietveld method. To ensure phase formation, further structural analyses, namely transmission electron microscopy, Raman spectroscopy and x-ray photoemission spectroscopy measurements are performed. Before analysing the magnetic properties of the prepared nanoparticles, Mo center dot ssbauer spectra are recorded both at room temperature and at 77 K to determine the magnetic nature and hyperfine behaviour of the nanoparticles. The resence of magnetically blocked states is estimated by recording the dynamic hysteresis loops and then to gain insight into the magnetic properties of this particular Li-Zn-Co-ferrite stoichiometry, static M -H loops and field cooled and zero field cooled M-T curves are extracted using a vibrating sample magnetometer. Finally, the applicability of prepared nanoparticles as a heat mediator in magnetic induction heating is studied in an external field of 335 Oe intensity and 290 kHz frequency. The highest specific absorption rate (SAR) is found to be-212 W/gFerrite for 47.3 nm nanoparticles at a concentration of only 1 mg/mL.