Magnetic and High-Frequency Dielectric Parameters of Divalent Ion-Substituted W-Type Hexagonal Ferrites
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- 作者：Akbar Ali ; R. Grössinger ; Muhammad Imran ; M. Ajmal Khan…
- 关键词：W ; type hexaferrites ; divalent ion substitution ; x ; ray diffraction ; M ; H loops ; dielectric parameters
- 刊名：Journal of Electronic Materials
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：46
- 期：2
- 页码：903-910
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials; Electronics and Microelectronics, Instrumentation; Solid State Physics;
- 出版者：Springer US
- ISSN：1543-186X
- 卷排序：46
文摘
Polycrystalline W-type hexagonal ferrites with chemical formulae Ba0.5Sr0.5Co2−xMexFe16O27 (x = 0, 0.5, Me = Mn, Mg, Zn, Ni) have been prepared using sol–gel autocombustion. It has been reported in our earlier published work that all the samples exhibit a single-phase W-type hexagonal structure which was confirmed by x-ray diffraction (XRD) analysis. The values of bulk density lie in the range of 4.64–4.78 g/cm3 for all the samples which are quite high as compared to those for other types of hexaferrites. It was also observed that Zn-substituted ferrite reflects the highest (14.7 × 107 Ω-cm) whereas Mn-substituted ferrite has the lowest (11.3 × 107 Ω-cm) values of direct current (DC) electrical resistivity. The observed values of saturation magnetization (Ms) are found to be in the range of 62.01–68.7 emu/g depending upon the type of cation substitution into the hexagonal lattice. All the samples exhibit a typical soft magnetic character with low values of coercivity (Hc) that are in the range of 26–85 Oe. These ferrites may be promising materials for microwave absorbers due to their higher saturation magnetization and low coercivities. Both the dielectric constant and tangent loss decrease with increasing frequency in the lower frequency region and become constant in the higher frequency region. The much lower dielectric constant obtained in this study makes the investigated ferrites very useful for high-frequency applications, i.e. dielectric resonators and for camouflaging military targets such as ships, tanks and aircrafts, etc.