Effect of Gd content on microstructure and electromagnetic properties of lithium ferrite-based composite
| Parent link: | Journal of Alloys and Compounds.— .— Amsterdam: Elsevier Science Publishing Company Inc. Vol. 1045.— 2025.— Article number 184804 12 p. |
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| Other Authors: | , , , |
| Summary: | The structure and electromagnetic properties of composite ferrite obtained by the solid-phase method from Fe2O3/Li2CO3/Gd2O3 in different weight ratios were investigated by X-ray phase analysis, thermogravimetry, differential scanning calorimetry, scanning electron microscopy and energy-dispersive spectroscopy, as well as by measuring the initial magnetic permeability, hysteresis loop parameters, Curie temperature, DC electrical resistance and dielectric characteristics in the frequency range up to 106 Hz. It was established that during the synthesis of ferrite at 900°C for 4 h, a two-phase composite was formed, consisting of a main phase based on lithium ferrite (Li0.5Fe2.5O4) with a spinel structure and a secondary phase (GdFeO3) with a perovskite-like structure. The structural transformation of the orthorhombic GdFeO3 into the cubic Gd3Fe5O12 phase occurred during high-temperature sintering at 1100 °C and 1150 °C. Increasing the sintering temperature to 1150 °C made it possible to increase the density and reduce the porosity of the composite, especially at low concentrations of REE. It was found that the magnetic composite of Li0.5Fe2.5O4(93.4 wt%)−Gd3Fe5O12(6.6 wt%) composition has good characteristics, including a Curie temperature of 629 °C, magnetic permeability of 40.7, saturation magnetization of 53 emu/g, coercivity of 11 Oe. Moreover, the secondary phase located along the boundaries of ferrite grains had a significant impact on the electrical properties of the composite, increasing the specific electrical resistance from 80 to 106 Ohm·cm for the above-mentioned composition. This ensured lower dielectric losses of ferrite across the entire frequency range Текстовый файл AM_Agreement |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/j.jallcom.2025.184804 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=683493 |