Magnetic and microwave properties of BaFe12O19 substituted with magnetic, non-magnetic and dielectric ions
| Autor: | Zilhicce Mehmedi, Hüseyin Sözeri, H. Kavas, Abdulhadi Baykal |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Magnetometer Process Chemistry and Technology Solid-state reaction route Reflection loss Analytical chemistry Crystal growth Dielectric Ferromagnetic resonance Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention law Materials Chemistry Ceramics and Composites Dielectric loss Microwave |
| Zdroj: | Ceramics International. 41:9602-9609 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2015.04.022 |
| Popis: | Barium hexaferrite particles were synthesized with conventional solid state reaction route. 1% boron (B 2 O 3 ) was added to the initial mixture of oxides to inhibit crystal growth at lower temperatures. Magnetic (Mn 2+ , Co 2+ , Ni 2+ and Cu 2+ ), non-magnetic (Zn 2+ ) and dielectric (Ti 4+ ) ions were replaced by one Fe 3+ ion of barium hexaferrite to shift the ferromagnetic resonance frequency to low frequencies and to increase the magnetic and dielectric losses. The structural and morphological characterization of samples was done by X-ray powder diffractometer and scanning electron microscopy. Magnetic and microwave properties were determined by vibrating sample magnetometer and vector network analyzer, respectively. The maximum saturation magnetization and the highest reflection losses of −34 dB at 10 GHz, with absoption bandwidth of 1.6 GHz at −20 dB, were observed in Cu 2+ –Ti 4+ and Zn 2+ –Ti 4+ substituted samples. The mechanism of microwave energy dissipation is due to the impedance matching at matching thickness. It was also observed that as the sample thickness increases, the resonance frequency decreases exponentially. |
| Databáze: | OpenAIRE |
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