Structural properties and hyperfine interactions in Co–Zn Y-type hexaferrites prepared by sol–gel method

Y-type barium hexaferrites Ba2Co2−xZnxFe12O22 (0.0≤x≤2.0) were prepared using sol–gel method and then sintering at temperatures between 900 and 1100°C. The properties of the prepared samples were investigated using X-ray diffraction, scanning electron microscopy, and Mössbauer spectroscopy. XRD patt...

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Bibliographic Details
Published in:Ceramics international 2014-05, Vol.40 (4), p.5231-5236
Main Authors: Mahmood, S.H., Jaradat, F.S., Lehlooh, A.-F., Hammoudeh, A.
Format: Article
Language:English
Subjects:
Cationic
Ceramics
Co2-Y hexaferrites
Hyperfine structure
Mossbauer spectroscopy
Preferential site occupation
Sintering
Sol gel process
Sol–gel method
Zinc
Zn substitution
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Summary:Y-type barium hexaferrites Ba2Co2−xZnxFe12O22 (0.0≤x≤2.0) were prepared using sol–gel method and then sintering at temperatures between 900 and 1100°C. The properties of the prepared samples were investigated using X-ray diffraction, scanning electron microscopy, and Mössbauer spectroscopy. XRD patterns revealed the presence of a single Y-type hexaferrite phase in the samples sintered at temperatures above 1000°C. Mössbauer data indicated that Co2+ ions occupied octahedral sites in the T blocks, while Zn2+ ions were distributed between the two tetrahedral sites. This trend for cationic distribution resulted in weakening the superexchange interactions between spin-up and spin-down sublattices with increasing Zn content, and a consequent reduction in the hyperfine fields in Zn rich compounds.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2013.10.092