Low Loss Z-Type $\hbox{Ba}_{3}\hbox{Co}_{2}\hbox{Fe}_{24}\hbox{O}_{41}$ Hexaferrites for Antennas and RF Devices
| Autor: | Henk Verweij, Kubilay Sertel, A. Puri, Lanlin Zhang, John L. Volakis |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
Analytical chemistry Sintering Microstructure Electronic Optical and Magnetic Materials law.invention Colloid Nuclear magnetic resonance law Permeability (electromagnetism) visual_art Eddy current visual_art.visual_art_medium Cobalt compounds Ceramic Electrical and Electronic Engineering Magnetic leakage |
| Zdroj: | IEEE Transactions on Magnetics. 47:2149-2152 |
| ISSN: | 1941-0069 0018-9464 |
| Popis: | Z-type hexaferrites are considered for applications in the 10 MHz to 1 GHz band due to their potential to overcome Snoek's limit. However, state-of-art hexaferrites have high magnetic loss, related to substantial micro-structural inhomogeneity and processing details. The dependence of magnetic properties on the ceramic processing route is demonstrated in this paper for Ba3Co2Fe24O41 (Co2Z) compositions. Fine Co2Z powders prepared by wet-chemical synthesis were used to obtain different microstructures through dry or colloidal compaction, followed by sintering with different temperature programs. Large variations in permeability and loss behavior were found between samples with different processing histories and hence microstructures. The best results obtained were μr' ~ 2.5 and μr'' |
| Databáze: | OpenAIRE |
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