Effect of Substitution on the Electric and Magnetic Properties of Ferrites

Abstract

This chapter summarizes the effect of monovalent, divalent, trivalent, and tetravalent elements substitution on the electric and magnetic properties of spinel ferrites. Due to the doping of different cations, drastic changes take place in the properties of spinel structure. The spinel structure of the ferrite possesses insulating properties at room temperature and magnetic due to the presence of iron in the material. As well as the preparation method plays a crucial role to vary the physical properties of ferrite, in the result, possibility to use these spinel ferrite materials in a variety of applications. By changing the synthesis route of the magnetic ferrite specimens, can be utilized as superparamagnetic materials for specific biomedical applications. The temperature can affect the electrical properties as more than one valence state of the ions in the interstitial sites of ferrite by hopping mechanism. The various dopants modify the exchange interaction, spin canting, cation distribution, Curie temperature, saturation magnetization, nuclear hyperfine field, ac resistivity, dc resistivity, and many other properties of spinel ferrite materials.

Atomic-Scale Structural and Magnetic Coupling Properties of Twin Boundaries in LiFe5O8 Film

“…In contrast, TB III typically develops FM couplings across boundaries with the interface formation energy -0.06 J/m 2 lower than that of AFM coupling. The weak FM coupling at TB III is likely to result from the Fe cation deficiency, which leads to the decreased density of super-exchange interactions between cations via oxygens [23].…”

Investigating the magnetic domain structure and photonics characters of Singled Phased hard ferromagnetic Ferrite MFe3O4 (M= Co2+, Zn2+, Cd2+) Compounds

“…According to reports, ferrite (iron oxide) has an energy band gap of 2.2 eV [31], but its physical state changes when metallic ions like Cd 2+ , Zn 2+ , and Co 2+ are sandwiched into it. When the bivalent cationic metals in ferrite is replaced, the cations are redistributed on tetrahedral site-A and octahedral site-B, resulting in a change in energy band gap [32][33][34][35].…”

Synthesis and Characterization of (Ni,Co)xMn0.25-xMg0.75Fe2O4 Nanoparticles

“…Based on the figure, a nonhomogeneous distribution of the particle size with some agglomeration can be attributed to the fact that the particles were exposed to a permanent magnetic moment that was proportionate to their size [22,23]. During the combustion process, a significant quantity of toxic gas is emitted like oxygen‫و‬ nitrogen, and carbon dioxide, which causes the powders to developing pores, voids, and fractured surfaces, and is often absent from most other synthetic techniques products [24,25]. These features are visible in scanning electron microscopy of the prepared powders.…”