Studies on the solid state properties of the solid solution system MgAl2−xFexO4

Abstract

The solid solutions between the spinels MgAl2O4 and MgFe2O4 with the general formula MgAl2 − xFexO4 are synthesised and characterised by X‐ray diffraction and application of Vegard's law. The cation distribution in this spinel system is determined from X‐ray and magnetic susceptibility measurements. The electrical and magnetic properties of the system are also studied and the interesting variation of these properties are explained in terms of the changes in spinel structure.

Effect of Fe3+ in Li-Mn Aluminates synthesized by co-precipitation method for the application of opto-magnetic and Magnetic refrigeration applications

“…The shift of peaks is in accordance with Bragg's law and substitution of dopant species [19,20]. The intensities of (220) and (440) planes are more sensitive to cations in tetrahedral and octahedral sites respectively [21,22]. From TABLE 1 it is clear that intensity of (440) decrease with increasing Fe 3+ and this expressing decreasing Al 3+ ions in the octahedral sites.…”

Structural, morphological and magnetic properties of NiFe2O4 nano-particles

“…The intensities of the (2 2 0), (4 4 0) and (5 1 1) planes are more sensitive to the cations on tetrahedral, octahedral and the oxygen ion parameters, respectively [27][28][29]. As reported earlier Ni 2+ ions have a strong preference to occupy B sites [29].…”

Dielectric relaxation, conductivity behavior and magnetic properties of Mg substituted Zn–Li ferrites

“…At high frequency the grains come into action and also the hopping of electrons cannot follow the high-frequency ac field, therefore the dielectric constant becomes low and frequency independent. ions have preference to occupy both tetrahedral and octahedral sites in the spinel lattice [13,26], therefore, with the increase of Mg 2þ ion content, some of the Mg 2þ ions occupy the tetrahedral site (A-site) and displaces the Fe 3þ ions from A-site to B-site. Thus more Fe 2þ eFe 3þ ion pairs are available at B-site for hopping mechanism resulting in the increase of dielectric polarization and hence of dielectric constant.…”