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    Rare earth substituted M-type lead hexaferrite: synthesis, electrical and magnetic properties
    (Korean Assoc Crystal Growth, Inc, 2025) Ertug, Burcu
    In this article, the synthesis and the electrical and magnetic characterization of the M-type lead hexaferrite were presented. Rare-earth substituted lead hexaferrite was synthesized by the traditional ceramic process. The final product was obtained by sintering the lead hexaferrite compact at 950 degrees C for 2 h. According to the XRD analysis, secondary phases did not appear in the patterns. The electrical polarization curve of the sample did not confirm the ferroelectric response. The dielectric constant vs. frequency indicated a reduction trend. As observed from the polarization curve, the polarization value changed between 0.8 and-0.8 mu C/cm2 under the voltage of 5.76 kV. The high symmetry of the crystal in this sample is proposed to be the origin of the absence of ferroelectric response. Vibrating sample magnetometer (VSM) measurements confirmed the ferrimagnetic behaviour for both RT and low temperature. The saturation magnetizations (Ms) were found to be 7.54-8.08 emu/g in the temperature range of 7-22 K and the highest coercivity value was found to be 1.2 kOe and this result depicts the magnetically soft nature and multi-domain structure. The results showed that the obtained lead hexaferrite sample has acceptable magnetic properties.
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    Synthesis and Characterization of Cu-Co Substituted Strontium Hexaferrite for Magnetic Applications
    (Kaunas Univ Tech, 2024) Ertug, Burcu
    In this study, the structural and magnetic characterizations of a series of SrCoxCuxFe12-2xO19; 0.0 <= x <= 0.5 samples, which were produced by the conventional ceramic method, were carried out. The structure was examined by X-ray diffraction (XRD) technique and optical microscopy. A vibrating sample magnetometer (VSM) was used to characterize the ferrimagnetic properties. XRD patterns confirmed the presence of a single phase as Sr-hexaferrite while there were not any peaks of unreacted Fe2O3 phase. The densities varied between 92 - 98 %. XRD patterns of the Sr-hexaferrite samples were slightly modified because of the co-substitution of Cu-Co; however, the magnetic properties changed remarkably. The sample with Cu-Co of x = 0.1 content had the highest saturation magnetization (33.52 emu/g), remanence (19.74 emu/g), and coercivity (4.3 kOe). The synthesized magnetic samples were found to be suitable for the development of attractive ferrimagnetic properties for the current ferrite magnets.