Abstract
Co-Cr nano-ferrites, having the chemical formula CoCrxFe2-xO4 (where x = 0.0, 0.1, 0.3, 0.5, 0.7, 0.9 and 1.0), were synthesized by the Citrate-gel auto combustion method. Synthesized powders were sintered at 500°C for 4 hours in an air and were characterized by XRD, SEM and EDS. XRD analysis showed cubic spinel structure of the ferrites and the crystallite sizes (D) were found in the range of 6 - 12 nm. The values of lattice parameter (a) decreased and X-ray density (dx) increased with the increase of Cr content. Scanning Electron Microscopic (SEM) studies revealed nano crystalline nature of the samples. An elemental composition of the samples was studied by Energy Dispersive Spectroscopy (EDS). The observed results can be explained on the basis of composition and crystal size.
Highlights
Spinel ferrites are commercially important materials due to their excellent magnetic and electrical properties [1]
Chromium substituted Cobalt ferrites are of particular interest in which the Cr+3 ions are reported to have a strong preference for the B sites (Octahedral) of the spinel structure of the ferrites [10,11]
It is known that the properties of the ferrites depend strongly on their composition and micro structure which are sensitive to the processing methods used to synthesize them
Summary
Spinel ferrites are commercially important materials due to their excellent magnetic and electrical properties [1]. Cobalt ferrites have received recent attention as they possess excellent chemical stability, good mechanical hardness, remarkably high electrical resistivity, and large permeability at high frequency and cost effectiveness [3,4]. Due to these properties, cobalt ferrites have been extensively used in electronic devices [3,4], Magnetic Resonance Imaging (MRI), Target drug delivery, Hyperthermia for cancer treatment [5,6], high density storage devices, magnetic fluids [7,8], transformer cores, microwave devices, humidity and gas sensors, etc. In the present study we preferred the Citrate Gel auto combustion method for the synthesis of Chromium substituted Cobalt nano-ferrites
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