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Efects of Molybdenum Concentration and Valence State on the Structural and Magnetic Properties of BaFe_(11.6)Mo_xZn_(0.4-x)O_(19) hexaferrites

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Acta Metallurgica Sinica(English Letters) 2013年第5期26卷 509-516页

作者： G.h.Dushaq S.h.Mahmood I.Bsoul h.k.juwhari B.Lahlouh M.A.AlDamen Physics Department The University of Jordan Physics Department Al al-Bayt University Chemistry Department The University of Jordan

Barium hexaferrites BaFe11.6Mox Zn0.4-x O19（x=0.1,0.2,0.4）were prepared by precipitation of the precursors using wet chemical mixture method and then sintering the dried powders at 1100℃.The properties of the prepared samples were investigated using X-ray difraction（XRD）,scanning electron microscopy（SEM）,vibrating sample magnetometer,and Mssbauer *** patterns revealed that all prepared samples had BaFe12O19hexaferrite structure as a majority *** images demonstated that the samples consisted mainly of hexagonal platelet-like grains with diameters ranging from 100 to 500 nm.Mssbauer spectra revealed that Zn2＋ions occupy 4f1 sites leading to the splitting of the 12k *** Mo6＋ions occupy 2b sites while Mo4＋ prefer 4f1 and 12k *** the sample with x=0.4,Mo6＋and Mo4＋ ions were found to have preference for 2b and 12k sites,respectively,and to induce the development of Fe2＋ions in the hexaferrite,leading to noticeable changes in the magnetic properties of the *** observed magnetic properties were found to be consistent with the preferential site occupation of metal ions,and the hyperfine fields derived from Mssbauer spectra of these samples.

关键词： Coercivity Barium hexaferrites Mossbauer spectroscopy Magneticproperties hyperfine Interactions

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Magnetic Properties and hyperfine Interactions in M-Type BaFe_(12-2x)Mo_(x)Zn_(x)O_(19) hexaferrites

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Journal of Applied Mathematics and Physics 2014年第5期2卷 77-87页

作者： Sami h.Mahmood Ghada h.Dushaq Ibrahim Bsoul Mufeed Awawdeh hassan k.juwhari Bashar I.Lahlouh Murad A.AlDamen Physics Department The University of JordanAmmanJordan Physics Department Al al-Bayt UniversityMafraqJordan Physics department Yarmouk UniversityIrbidJordan Chemistry Department The University of JordanAmmanJordan

A series of M-Type barium hexaferrites with the general composition BaFe12-2xMoxZnxO19 were synthesized at 1100°C by a simple wet chemical mixture route. The properties of the prepared samples were examined by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometry, and Mössbauer spectroscopy. The diffraction patterns for all samples were found to agree well with the standard pattern of BaFe12O19 hexaferrite with no extraneous diffraction peaks. The products formed as well crystallized hexagonal platelet-like particles while the EDS measurements revealed the stoichiometric cationic ratios of the prepared samples. The spectral variations elucidated by Mössbauer spectroscopy were utilized to determine the different cation preferential site occupations as a function of x. Finally, the saturation magnetizations, magnetic anisotropies, and the anisotropy fields, determined from the magnetic measurements, showed consistency with the relative subspectral Mössbauer intensities and the single ion model for the anisotropy constant.

关键词： Mossbauer Spectroscopy Magnetic Properties hysteresis Crystal Field Sintering Magnetic Materials

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