Structural, spectral, magnetic, and electrical properties of Gd–Co-co-substituted M-type Ca–Sr hexaferrites synthesized by the ceramic method
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Gd–Co-co-substituted M-type Ca–Sr hexaferrites with nominal compositions Ca0.40Sr0.60−xGdxFe12.00−xCoxO19 (0.00 ≤ x ≤ 0.32) were prepared using the standard ceramic method. The particle size of obtained hexaferrite powders is between 2 and 5 µm. These hexaferrites were characterized by thermal analyzer (TG-DSC), X-ray diffractometer (XRD), Fourier transformer infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), vibrating sample magnetometer (VSM), and resistivity testing system. XRD patterns showed that the single M-type hexaferrite phase was obtained only if Gd–Co content (x) ≤ 0.16. FE-SEM micrographs indicated that the grains were platelet-like shapes. The saturation magnetization (Ms) and remanent magnetization (Mr) decreased with increasing Gd–Co content (x) from 0.00 to 0.32. The coercivity (Hc) first increased with Gd–Co content (x) from 0.00 to 0.24, and then decreased when Gd–Co content (x) ≥ 0.24. The DC electrical resistivity decreased with increasing Gd–Co content (x) from 0.00 to 0.32.
This work was supported by the National Natural Science Foundation of China (nos. 51272003 and 51472004), the Scientific Research Fund of SiChuan Provincial Education Department (nos. 13ZA0918, 14ZA0267, and 16ZA0330), the Major Project of Yibin City of China (nos. 2012SF034, 2016GY025, and 2016 QD002), Scientific Research Key Project of Yibin University (no. 2015QD13), and the Open Research Fund of Computational Physics Key Laboratory of Sichuan Province, Yibin University (no. JSWL2015KFZ04). This work was financially supported by the Anhui University Collaborative Innovation Research Center for “weak signal sensing materials and device integration” (Open Project in 2016). This work was financially supported by the Natural Science Foundation of China (Grant 51301152). This work was carried out with a financial support in part from the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” among the leading world scientific and educational centers (nos. П02-2017-2-4, К3-2017-059). In SUSU, this work was supported by Act 211 Government of the Russian Federation, contract no. 02.A03.21.0011. In addition, the work was partially supported by the Ministry of Education and Science of the Russian Federation (10.9639.2017/8.9). Government task in SUSU 5.5523.2017/8.9.
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