期刊
CERAMICS INTERNATIONAL
卷 44, 期 1, 页码 723-727出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.09.236
关键词
Nanoferrites; Magnetic permeability; Miniaturization
In this study, we synthesized ferrites with the formula Niw(0.5-x)Cu Zn0.5Fe2O4 and sintered them to x = 0, 0.1, 0.2 and 0.3 using the citrate precursor method. We then analyzed the sintered toroids by X-ray diffraction (XRD) with Rietveld refinement. Scanning electron microscopy (SEM) results showed there to be uniform grains in NiZn, abnormal grains at x = 0.2 with a remnant of the CuO liquid phase, and large grains at x = 0.3. We then analyzed the toroids by vibrating sample magnetometry (VSM). The hysteresis reached a saturation magnetization (Ms) value of 88.37 emu/g and a coercive field (Hc) of 0.0016 T. We calculated the Bohr magnetons using the Ms information and obtained the magnetic permeability with a vector network analyzer (VNA). The toroid with the remnant CuO phase showed relative permeability values of between 20 and 30 and low losses in a wide range of frequencies (10-50 MHz), which we attribute to the microstructure characteristics. Based on our results, this ferrite can be used in the miniaturization of magnetic components used in electro electronic devices.
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