Effect of aluminium substitution on electric, magnetic, and microwave properties of LiTi ferrite

Abstract

Effects of substitution of diamagnetic Al3+ ion in LiTi ferrite on its electric and magnetic properties are reported. These parameters are studied as a function of temperature, frequency, and concentration. The dielectric data are verified with a modified relation of Koops' two layer model. Other fundamental properties like hysteresis loop parameters viz. coercive force and remanence ratio, and Curie temperature are also found to be affected by Al3+ substitution. FMR linewidth and spin wave line width show a very slow increase with addition of aluminium. The activation energy is found to decrease with the increase in Al3+ concentration and frequency.

Finite size effects on the electrical properties of sol–gel synthesized CoFe2O4powders: deviation from Maxwell–Wagner theory and evidence of surface polarization effects

“…The frequency dispersion relation given by Habery and coworkers [20,21] in which the dielectric permittivity decreases with increasing frequency reaches a constant value for all the samples. Similar behaviour was observed earlier for other systems of ferrites.…”

Synthesis and characterization of nano-sized pure and Al-doped lithium ferrite having high value of dielectric constant

“…Therefore we have prepared an Al-doped lithium ferrite by this method. Lithium and substituted lithium ferrites are of great importance in the microwave and memory core applications owing to their high Curie temperature, high saturation magnetization, and excellent hysteresis loop properties and less sensitive to stress [7][8][9]. In addition lithium ferrites do not contain costly ingredients [10].…”

Structural, magnetic and electrical properties of the sol-gel prepared Li0.5Fe2.5O4fine particles

“…Lithium ferrites (Li 0.5 Fe 2.5 O 4 ) are useful materials for microwave devices and memory core applications [7][8][9][10]. Lithium ferrite crystallizes in the inverse spinel structure.…”

“…Lithium ferrite crystallizes in the inverse spinel structure. Though lithium ferrites have been a thoroughly investigated ferrite system [10,11], because of their excellent square sloop characteristics, this system is being revisited to investigate the finite size effects as well as to devise new materials based on lithium ferrite for microwave and other applications. Synthesis of structurally stabilized lithium ferrite with and without flux is still a hot topic of research in the area of magnetic materials.…”