Structural, magnetic and electrical properties of the sol-gel prepared Li_0.5Fe_2.5O₄fine particles

Abstract

We have measured the dielectric properties of nickel ferrite (NiFe 2 O 4 ) synthesized by the micelles mixing method, prepared in suspension of coconut oil and annealing for 4 h at different temperatures. The as-grown ferrites presented highly amorphous X-ray spectrum. Post preparation annealing was applied to induce the increase in the size of the nanoparticles in order to tune the dielectric responses of the samples at the microwave frequencies.The X-ray diffraction (XRD) was applied to investigate the nanoparticle size dependence on the annealing temperature, allowing the correlation between the nanoparticle size and the observed microwave dielectric response.The micelles mixing method of preparation is then a cheap procedure to obtain high quality nanostructured nickel ferrites with low dielectric losses, and dielectric constant between 2.4 and 3.6. Zn-substituted Ni-Mg ferrites, J Magn Magn Mater 192 (1999), 305-313. 11. E.M. Mohammed, K.A. Malini, P. Kurian, and M.R. Anantharaman, Modification of dielectric and mechanical properties of rubber

Structural and Electrical Properties of Ni-Zn Ferrite Nanoparticles: Influence of Mixed Fuel Approach

“…From table 1, it was understood that the calculated values of lattice constant of Ni-Zn ferrite nanoparticles is 8.378 A o which agree with the reported values [17].The crystallite size of the Ni-Zn ferrite nanoparticles is 16 nm. Small crystallite size is due to using mixed.…”

Effect of Sintering Time on the Structural, Magnetic and Electrical Transport Properties of Mg<sub>0.35</sub>Cu<sub>0.20</sub>Zn<sub>0.45</sub>Fe<sub>1.94</sub>O<sub>4</sub> Ferrites

“…ε′ increases as the temperature increases which is the normal dielectric behaviour magnetic semiconductor ferrites. The increase in ε′ with temperature was earlier observed for the Mg-Ti [35], Ni-Zn [36,37], Li 0.5 Fe 2.5 O 4 [38], Mg-Zn [39] ferrites. The hopping of electrons between Fe 2+ and Fe 3+ ions (at adjacent B-sites) is thermally activated on increasing the temperature.…”

Effect of Annealing Temperature on the Structural and Magnetic Properties of NiFe<sub>2</sub>O<sub>4</sub> Nanoferrites

“…With the increase in annealing temperature the coercivity gradually decreased and attained a minimum value of 7.2 Oe. The decrease in the coercivity with annealing temperature may also be accounted for the multi domain nature in the samples at higher annealing temperatures [25].…”