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    Ferroelectromagnetic characteristic of Na-doped 0.75BiFeO 3-0.25BaTiO3 multiferroic ceramics
    (2013-05-01)
    Prasatkhetragarn, Anurak
    ;
    Arthan, Ammaruta
    ;
    Jantaratana, Pongsakorn
    ;
    Vittayakorn, Naratip
    ;
    Yotburut, Benjaporn
    BiFeO<inf>3</inf>-based materials are expected to have both ferroelectricity and ferromagnetism simultaneously. In this study, effects of Na-doping (0.5, 1.0, 3.0, and 5.0 mol%) on ferromagnetic and ferroelectric properties of 0.75BiFeO<inf>3</inf>-0.25BaTiO<inf>3</inf> ceramics which have been fabricated by the solid state reaction technique are studied. The effects of Na-doped 0.75BiFeO<inf>3</inf>-0.25BaTiO<inf>3</inf> ceramics on the crystal structure, and magnetic and electrical properties were investigated and discussed. Rhombohedrally distorted 0.75BiFeO<inf>3</inf>-0.25BaTiO<inf>3</inf> showed weak ferromagnetic and ferroelectric properties. In addition, ferroelectric and ferromagnetic properties of 0.75BiFeO<inf>3</inf>-0. 25BaTiO<inf>3</inf> have been controlled by Na doping, and the maximum values of magnetization and polarization were observed at 5.0 mol%. © 2012 Elsevier Ltd and Techna Group S.r.l.
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    Structural and magnetic properties of nanocrystalline zinc-doped metal ferrites (metal=Ni; Mn; Cu) prepared by sol-gel combustion method
    (2013-05-01)
    Tangcharoen, Thanit
    ;
    Ruangphanit, Anucha
    ;
    Pecharapa, Wisanu
    In this work, nanocrystalline M-Zn ferrites (M=Ni; Mn; Cu) with compositions of M<inf>1-x</inf>Zn<inf>x</inf>Fe<inf>2</inf>O<inf>4</inf> (x=0.0, 0.2 and 0.4) were synthesized from metal nitrate precursors by rapid the sol-gel combustion method using diethanolamine (DEA) as the fuel. As-synthesized powders were calcined at 1000 °C for 4 h. The crystal structures and morphologies of these compounds were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM), respectively. The chemical interaction of ferrite powders was investigated by Fourier transform infrared spectroscopy (FTIR). The magnetic properties of after-calcined nanoparticles were measured at room temperature using a vibrating sample magnetometer (VSM). The single phase spinel cubic structure formation is confirmed by XRD and FTIR results. Meanwhile FE-SEM micrographs show the appearance of both undoped and Zn-doped ferrite ceramic samples. In addition, the VSM analyses indicate that the Zn content has a significant influence on the magnetic properties such as saturation magnetization (M<inf>s</inf>) and coercivity (H<inf>c</inf>). © 2012 Elsevier Ltd and Techna Group S.r.l.