Effects of Molybdenum Concentration and Valence State on the Structural and Magnetic Properties of BaFe11.6MoxZn0.4-xO19 Hexaferrites

doi:10.1007/s40195-013-0075-2

Acta Metallurgica Sinica (English Letters)

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Effects of Molybdenum Concentration and Valence State on the Structural and Magnetic Properties of BaFe_11.6Mo_xZn_0.4-xO₁₉ Hexaferrites

G.H. Dushaq¹⁾, S.H.Mahmood¹⁾, I. Bsoul²⁾, H.K. Juwhari¹⁾, B.Lahlouh¹⁾ , M.A. AlDamen³⁾

1) Physics Department, The University of Jordan, Amman 11942, Jordan
2) Physics Department, Al al-Bayt University, Mafraq 13040, Jordan

3) Chemistry Department, The University of Jordan, Amman 11942, Jordan

Received:2013-02-20 Revised:2013-04-27 Online:2013-10-25 Published:2013-09-13
Contact: S.H. Mahmood
Supported by:
Scientific Research Fund (SRF) in Jordan under grant number (S/1/21/2009). The financial support of the German Academic Exchange Program (DAAD), and the Deanship of Scientific research at the University of Jordan under contract number 1404 are also acknowledged

Abstract

Abstract:

Barium hexaferrites BaFe_11.6Mo_xZn_0.4-xO₁₉ (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 diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer, and Mossbauer spectroscopy. XRD patterns revealed that all prepared samples had BaFe₁₂O₁₉ hexaferrite structure as a majority phase. SEM images demonstated that the samples consisted mainly of hexagonal platelet-like grains with diameters ranging from 100 to 500 nm. Mossbauer spectra revealed that Zn^{2 +} ions occupy 4f₁ sites leading to the splitting of the 12k component. However Mo^{6 +} ions occupy 2b sites while Mo^{4 +} prefer 4f₁ and 12k sites. For the sample with x = 0.4, Mo^{6 +} and Mo⁴⁺ ions were found to have preference for 2b and 12k sites, respectively, and to induce the development of Fe^{2 +} ions in the hexaferrite, leading to noticeable changes in the magnetic properties of the system. The observed magnetic properties were found to be consistent with the preferential site occupation of metal ions, and the hyperfine fields derived from Mossbauer spectra of these samples.

Key words: Coercivity, Barium Hexaferrites, Mossbauer spectroscopy, Magnetic properties, Hyperfine Interactions

G.H. Dushaq, S.H.Mahmood, I. Bsoul, H.K. Juwhari, B.Lahlouh, M.A. AlDamen. Effects of Molybdenum Concentration and Valence State on the Structural and Magnetic Properties of BaFe_11.6Mo_xZn_0.4-xO₁₉ Hexaferrites[J]. Acta Metallurgica Sinica (English Letters), DOI: 10.1007/s40195-013-0075-2.

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Effects of Molybdenum Concentration and Valence State on the Structural and Magnetic Properties of BaFe_11.6Mo_xZn_0.4-xO₁₉ Hexaferrites

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