KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/kmitl/1

Browse

Settings

Has files: NoSubject: search.filters.subject.C. Ferroelectric properties

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    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.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Crystal structure, microstructure and electrical properties of (1-x-y)Bi0.5Na0.5TiO3-xBi0.5K 0.5TiO3-yBiFeO3 ceramics near MPB prepared via the combustion technique
    (2013-05-01)
    Sumang, Rattiphorn
    ;
    Vittayakorn, Naratip
    ;
    Bongkarn, Theerachai
    (1-x-y)Bi<inf>0.5</inf>Na<inf>0.5</inf>TiO<inf>3</inf>-xBi <inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf>-yBiFeO<inf>3</inf> (BNKFT-x/y with 0.12≤x≤0.24, 0≤y≤0.07) lead-free piezoelectric ceramics have been prepared by the combustion technique. The effects of amounts of x and y on structures and electrical properties were examined. Powders and ceramics can be well calcined and sintered at 750 °C for 2 h and 1025-1050 °C, respectively. The results indicated that the crystalline structure and microstructure changed with the increase of x and y concentrations. XRD results of BNKFT-x/0.03 and BNKFT-0.18/y ceramics with 0.12≤x≤0.24 and 0≤y≤0.07 showed the rhombohedral-tetragonal morphotropic phase boundary (MPB). The addition of y caused a promoted grain growth while the addition of x suppressed the grain growth. The highest density (ρ=5.85 g/cm<sup>3</sup>), superior dielectric properties at T<inf>c</inf> (ε<inf>r</inf>=7846 and tan δ=0.02), remnant polarization measured at 40 kV/cm (P<inf>r</inf> = 20.1 μC/cm<sup>2</sup>) and piezoelectric coefficient (d<inf>33</inf>=213 pC/N) were obtained for x=0.18 and y=0.03. © 2012 Elsevier Ltd and Techna Group S.r.l.
      1