Arshad, Muhammad Imran;
Zahid, Hira;
Sajjad, Muhammad Tariq;
Tung, Le Duc;
Amin, N;
Thanh, Nguyen Thi Kim;
Amami, Mongi;
... Hasan, MS; + view all
(2024)
Improvements in dielectric, electrical and magnetic contributions in Ca0.5Co0.5CrxFe2-xO4 spinel ferrites by the substitution of Cr3+ ions.
Powder Technology
, 438
, Article 119469. 10.1016/j.powtec.2024.119469.
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Abstract
In present research, we employed sol-gel auto-combustion method to synthesize soft ferrites, specifically Ca0.5Co0.5CrxFe2-xO4, with Cr3+ doping, where x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5. As the Cr3+ concentration increased, we observed decrease in both the average crystallite size (from 16.4 nm to 13.5 nm) and lattice constant (form 8.3 Å to 8.2 Å). Notably, the Ca0.5Co0.5Cr0.3Fe1.7O4 sample exhibited the highest AC conductivity at room temperature. Raman spectroscopy confirmed the presence of five active molecular vibrational modes, namely A1g, Eg, and 3T2g. Direct current (DC) resistivity decreased with the increasing concentration of Cr3+, and the Ca0.5Co0.5Fe2O4 sample displayed the maximum DC resistivity (6.81 × 108 ohm cm) at a Curie temperature of 383 K. Magnetic properties of soft ferrites, characterized through M-H loop analysis, revealed coercivity values in the range of HC = 1242.6 Oe to 660.8 Oe. These synthesized ferrites exhibit potential applications in longitudinal recording media owing to their performance in the microwave frequency range (6.0 GHz to 13 GHz), consistent DC resistivity, and stable dielectric constant.
| Type: | Article |
|---|---|
| Title: | Improvements in dielectric, electrical and magnetic contributions in Ca0.5Co0.5CrxFe2-xO4 spinel ferrites by the substitution of Cr3+ ions |
| DOI: | 10.1016/j.powtec.2024.119469 |
| Publisher version: | http://dx.doi.org/10.1016/j.powtec.2024.119469 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Cr3+ doping; Dielectric materials; Raman modes; Electrical Conductivity; Magnetic properties |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10192967 |
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