Structural, magnetic, and Mössbauer spectroscopy of Cu substituted M-type hexaferrites
| Autor: | Yazan Maswadeh, Mufeed Awawdeh, Ibrahim Bsoul, Qassem I. Mohaidat, Hassan K. Juwhari, Ahmad Awadallah, Sami H. Mahmood |
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| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Materials science Valence (chemistry) Mechanical Engineering Ionic bonding 02 engineering and technology Coercivity 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetocrystalline anisotropy 01 natural sciences Condensed Matter::Materials Science Crystallography Mechanics of Materials Superexchange 0103 physical sciences X-ray crystallography Mössbauer spectroscopy General Materials Science 0210 nano-technology Ball mill |
| Zdroj: | Materials Research Bulletin. 74:192-201 |
| ISSN: | 0025-5408 |
| Popis: | BaFe 12− x Cu x O 19 hexaferrites were prepared using ball milling and sintering at 1100 °C. Refinement of the X-ray diffraction patterns was carried out to determine the structural parameters and the ionic distribution over the crystallographic sites. The preferential site occupation and valence state of Cu was consistent with the results obtained from the analysis of Mossbauer spectra. Further, the magnetic parameters of the samples were discussed in light of the structural and Mossbauer analyses. The magnetic phase transition temperature was found to decrease with the level of Cu substitution, in accordance with the reduction of the superexchange interactions. Further, the magnetic softening of the hexaferrite and the significant reduction in magnetocrystalline anisotropy with Cu substitution was consistent with the ionic distribution in the lattice. This study clearly demonstrated the feasibility of using a simple method to fabricate hexaferrites with a modified coercivity, while maintain the saturation magnetization high enough for practical applications. |
| Databáze: | OpenAIRE |
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