Enhancing the Magnetic Properties of Li-Sb Ferrites

Enhancing the Magnetic Properties of Li-Sb Ferrites A series of Li0.5 + z Sb z La x Fe2.5−2z−x O4 spinel ferrites were prepared by a standard ceramic technique. All samples sintered at 1100 ∘C with a heating rate of 4 ∘C/min. A single-phase cubic spinel structure was confirmed by X-ray diffraction analysis with the appearance of small peaks that represent secondary phases. AC conductivity as a function of frequency and temperature was carried out. The calculated values of the activation energy approve the obtained results and indicate the semiconductor properties of the investigated samples. Due to large ionic radius, La3+ ions cannot completely substitute Fe3+ ions. These ions occupy grain boundaries instead of spinel lattice and form secondary phases after interaction with other ions present in grain boundaries. The magnetic parameters were calculated from the magnetic susceptibility data, in the temperature range 300–900 K at three different magnetic field intensities of 2160, 3000, and 3800 Oe. The data showed a decrease in the magnetic susceptibility till it reaches the Curie temperature (T C). The observed decrease in the Curie temperature with La content was explained on the basis of Neel’s model and the cation distribution. One recommends the use of such sample in the application that demands high resistivity and high Curie temperature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Superconductivity and Novel Magnetism Springer Journals

Enhancing the Magnetic Properties of Li-Sb Ferrites

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer Science+Business Media New York
Subject
Physics; Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials
ISSN
1557-1939
eISSN
1557-1947
D.O.I.
10.1007/s10948-017-4054-0
Publisher site
See Article on Publisher Site

Abstract

A series of Li0.5 + z Sb z La x Fe2.5−2z−x O4 spinel ferrites were prepared by a standard ceramic technique. All samples sintered at 1100 ∘C with a heating rate of 4 ∘C/min. A single-phase cubic spinel structure was confirmed by X-ray diffraction analysis with the appearance of small peaks that represent secondary phases. AC conductivity as a function of frequency and temperature was carried out. The calculated values of the activation energy approve the obtained results and indicate the semiconductor properties of the investigated samples. Due to large ionic radius, La3+ ions cannot completely substitute Fe3+ ions. These ions occupy grain boundaries instead of spinel lattice and form secondary phases after interaction with other ions present in grain boundaries. The magnetic parameters were calculated from the magnetic susceptibility data, in the temperature range 300–900 K at three different magnetic field intensities of 2160, 3000, and 3800 Oe. The data showed a decrease in the magnetic susceptibility till it reaches the Curie temperature (T C). The observed decrease in the Curie temperature with La content was explained on the basis of Neel’s model and the cation distribution. One recommends the use of such sample in the application that demands high resistivity and high Curie temperature.

Journal

Journal of Superconductivity and Novel MagnetismSpringer Journals

Published: Mar 31, 2017

References

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