Structural, microstructural, magnetic and dielectric properties of Ni-Zn ferrite powders synthesized by plasma arc discharge process followed by post-annealing
| Autor: | Ahmad Safari, Mansoor Farbod, Kh. Gheisari |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) 02 engineering and technology Dielectric Atmospheric temperature range Coercivity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Nanocrystalline material Electronic Optical and Magnetic Materials Plasma arc welding 0103 physical sciences Ferrite (magnet) Crystallite Composite material 0210 nano-technology |
| Zdroj: | Journal of Magnetism and Magnetic Materials. 488:165369 |
| ISSN: | 0304-8853 |
| Popis: | In this work, Ni0.5Zn0.5Fe2O4 powders were prepared by plasma arc discharge method followed by the subsequent heat treatments within the temperature range of 1000–1250 °C. Structural, microstructural, magnetic and dielectric properties of the as-synthesized and heat treated powders are examined in detail. The results indicate that as-synthesized powders contain a mixture of ZnO, Fe0.72OZn0.13 and Ni-Zn ferrite phases. However, the quantitative amount of Ni-Zn ferrite phase gradually increases by post annealing process. This finding is accompanied by an improvement in the magnetic properties such that a single phase Ni-Zn ferrite with the average crystallite size of 212 nm, lattice parameter of 8.332 A, saturation magnetization of 35.1 emu/g and coercivity of 24.9 Oe is formed after annealing at 1250 °C. Nevertheless, dielectric properties measured in the frequency range 20 Hz–10 MHz exhibits a complex behaviour due to the different mechanisms that cause polarization. |
| Databáze: | OpenAIRE |
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