Abstract
The polycrystalline spinel oxides NixCo1−xFe2O4 with composition x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 were prepared by conventional solid state ceramic sintering technique in air at 1300°C. X-ray dif- fraction experiments were carried out on all the samples at room temperature in order to charac- terize the materials. X-ray diffraction patterns showed sharp peaks indicating the formation of single phase cubic spinel structure. The neutron diffraction experiments were performed on all samples at room temperature, with an incident monochromatic neutron beam of wavelength λ = 1.5656 A. The experimental neutron diffraction data were analyzed using the computer program FullProf in the Reitveld method. Reitveld refinement of the neutron diffraction data reveals that the samples possess cubic symmetry corresponding to the space group F d-3m. Cation distribution between the two sublattices of the spinel structure has been found from the analysis of the neu- tron diffraction data. Lattice parameters, oxygen position parameters, and overall temperature factors have also been determined from the analysis of neutron diffraction data. The lattice para- meter decreases and oxygen position parameter increases with increasing Ni content in the sys- tem. Sublattices and net magnetic moments have been determined from the refinement of neutron diffraction data. The magnetic structure at room temperature was found to be ferrimagnetic for all the samples.
Highlights
Spinel oxides have been the subject of great interest because of their wide applications in the high frequency devices [1]-[4]
Spinel ferrite plays an important role in a variety of technical fields such as telecommunication, AC and DC motors, switched mode power supplies, power distribution transformers, communication systems, digital memories, multilayer chip inductors, video and audio applications, radar and satellite communications and in many other technological applications like photoelectrical devices and gas sensors, magneto-mechanical stress and torque sensors, microwave devices and biomedical applications [5]-[7]
Co ions have been substituted by divalent Ni ions in order to determine the cation distribution, and other crystallographic and magnetic properties in the spinel system NixCo1−xFe2O4 using neutron diffraction technique
Summary
Spinel oxides have been the subject of great interest because of their wide applications in the high frequency devices [1]-[4]. The cubic structure permits to substitute cations selectively in the octahedral or tetrahedral sites or in both the sites. This helps to modify electrical properties and magnetic ordering in these systems. The physical properties of the spinel ferrites such as the electrical, magnetic and elastic properties are governed by the type of magnetic ions residing on the tetrahedral (A) site and octahedral (B) site of the spinel lattice and the relative strength of the inter- and intra-sublattice interactions [8] [17]. Co ions have been substituted by divalent Ni ions in order to determine the cation distribution, and other crystallographic and magnetic properties in the spinel system NixCo1−xFe2O4 using neutron diffraction technique
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