Structural, Magnetic and Microwave Characterization of Polycrystalline Z-Type Sr3Co2Fe24O41 Hexaferrite
| Autor: | Bénédicte Vertruyen, Svetoslav Kolev, Lan Maria Tran, Tanya Malakova, Kiril Krezhov, Tatyana Koutzarova, Petya Peneva, Raphael Closset, Daniela Kovacheva, A. J. Zaleski, Chavdar Ghelev |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
magnetic phase transition
Materials science Composite number lcsh:Technology Magnetization Condensed Matter::Materials Science General Materials Science lcsh:Microscopy lcsh:QC120-168.85 chemistry.chemical_classification Condensed matter physics lcsh:QH201-278.5 lcsh:T microwave properties Attenuation reflection losses Polymer Magnetic field chemistry lcsh:TA1-2040 Ferrite (magnet) lcsh:Descriptive and experimental mechanics Crystallite lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 Microwave Z-type hexaferrite |
| Zdroj: | Materials Volume 13 Issue 10 Materials, Vol 13, Iss 2355, p 2355 (2020) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13102355 |
| Popis: | We report results on the structural and microwave properties and magnetic phase transitions in polycrystalline Sr3Co2Fe24O41 hexaferrite synthesized by sol-gel auto-combustion and acting as a filler in a composite microwave absorbing material. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves revealed a change in the magnetization behavior at 293 K. The reflection losses in the 1&ndash 20 GHz range of the Sr3Co2Fe24O41 powder dispersed homogeneously in a polymer matrix of silicon rubber were investigated in both the absence and presence of a magnetic field. In the latter case, a dramatic rise in the attenuation was observed. The microwave reflection losses reached the maximum value of 32.63 dB at 17.29 GHz in the Ku-band. The sensitivity of the microwave properties of the composite material to the external magnetic field was manifested by the appearance of new reflection losses maxima. At a fixed thickness tm of the composite, the attenuation peak frequency can be adjusted to a certain value either by changing the filling density or by applying an external magnetic field. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |