Structural, magnetic, and Mössbauer spectroscopy of Cu substituted M-type hexaferrites

[Display omitted] •Single BaM hexaferrite structural phases with Cu substations were prepared.•The magnetocrystalline anisotropy decreased with Cu substitution.•The coercivity was significantly modified while the magnetization remained high.•Hexaferrites with 0.2–0.4 Cu possess properties suitable f...

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Bibliographic Details
Published in:Materials research bulletin 2016-02, Vol.74, p.192-201
Main Authors: Awadallah, Ahmad, Mahmood, Sami H., Maswadeh, Yazan, Bsoul, Ibrahim, Awawdeh, Mufeed, Mohaidat, Qassem I., Juwhari, Hassan
Format: Article
Language:English
Subjects:
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
ANISOTROPY
BARIUM COMPOUNDS
CERAMICS
COERCIVE FORCE
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER
COPPER COMPOUNDS
FERRATES
Magnetic materials
MAGNETIC PROPERTIES
MAGNETIZATION
MATERIALS SCIENCE
Mössbauer spectroscopy
PHASE TRANSFORMATIONS
SINTERING
TRANSITION TEMPERATURE
VALENCE
X-RAY DIFFRACTION
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Summary:[Display omitted] •Single BaM hexaferrite structural phases with Cu substations were prepared.•The magnetocrystalline anisotropy decreased with Cu substitution.•The coercivity was significantly modified while the magnetization remained high.•Hexaferrites with 0.2–0.4 Cu possess properties suitable for magnetic recording.•Ionic distributions from structural refinement agreed with Mössbauer spectroscopy. BaFe12−xCuxO19 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 Mössbauer spectra. Further, the magnetic parameters of the samples were discussed in light of the structural and Mössbauer 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.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2015.10.034