Optimizing the methods of synthesis for barium hexagonal ferrite: an experimental and theoretical study

Liu, Y., Drew, M. G. B. and Liu, Y. (2012) Optimizing the methods of synthesis for barium hexagonal ferrite: an experimental and theoretical study. Materials Chemistry and Physics, 134 (1). pp. 266-272. ISSN 0254-0584 doi: 10.1016/j.matchemphys.2012.02.062

Abstract/Summary

M-type barium hexaferrite (BaM) is a hard ferrite, crystallizing in space group P6(3)/mmc possessing a hexagonal magneto-plumbite structure, which consists of alternate hexagonal and spinel blocks. The structure of BaM is thus related to those of garnet and spinel ferrite. However the material has proved difficult to synthesize. By taking into account the presence of the spinel block in barium hexagonal ferrite, highly efficient new synthetic methods were devised with routes significantly different from existing ones. These successful variations in synthetic methods have been derived by taking into account a detailed investigation of the structural features of barium hexagonal ferrite and the least change principle whereby configuration changes are kept to a minimum. Thus considering the relevant mechanisms has helped to improve the synthesis efficiencies for both hydrothermal and co-precipitation methods by choosing conditions that invoke the formation of the cubic block or the less stable Fe3O4. The role played by BaFe2O4 in the synthesis is also discussed. The distribution of iron from reactants or intermediates among different sites was also successfully explained. The proposed mechanisms are based on the principle that the cubic block must be self-assembled to form the final product. Thus, it is believed that these formulated mechanisms should be helpful in designing experiments to obtain a deeper understanding of the synthesis process and to investigate the substitution of magnetic ions with doping ions.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/30368
Item Type	Article
Refereed	Yes
Divisions	Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
Uncontrolled Keywords	Ceramics; Chemical synthesis; Magnetic properties; Mechanism; Hydrothermal; Co-precipitation
Publisher	Elsevier
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