Dielectric and electrical properties of Cr substituted Mg ferrites

Abstract

The spinel ferrites MgCr x Fe 2-x O 4 (0.0    1.0) were prepared through the solid state reaction using conventional ceramic method at 1300C in air. The homogeneous phase of the ferrite samples was observed from the X-ray diffraction study. Lattice parameter of the samples was found to decrease with increasing Cr concentration in the system obeying Vegard's law. The ac electrical resistivity, measured as a function of temperature, decreases with the increase of temperature indicating the semiconducting nature of all the samples. The activation energies were calculated and found to decrease with increasing Cr content. The lower activation energies are associated with higher electrical conductivity. With the increase of temperature, dielectric constant () and dielectric loss tangent are observed to be increased; while with the increase of frequency, dielectric constant () and dielectric loss tangent decrease for all the samples.

Fabrication of Highly Sensitive Electrochemical Sensor Based on Chromium-Doped Ferrite Nanoparticles: Hybrid Graphene Nanosheets for the First Voltammetric Determination of Asenapine Maleate in Formulations and Human Plasma

“…The slight variation in lattice constant may be attributed to very slight difference in the ionic radii of Fe 3+ (0.64 Å) and Cr 3+ (0.63 Å) ions. [51][52][53] The results confirm formation of the nano-crystalline structures, Table S1. The crystallite size is consistent with that reported for nanoferrites 49,54 and which is essential for construction of any nanosensor.…”