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Author: search.filters.author.Vittayakorn, NaratipSubject: search.filters.subject.Barium zirconate titanate

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    Barium zirconate titanate nanoparticles synthesized by the sonochemical method
    (2013-05-01)
    Seeharaj, Panpailin
    ;
    Boonchom, Banjong
    ;
    Charoonsuk, Piyanut
    ;
    Kim-Lohsoontorn, Pattaraporn
    ;
    Vittayakorn, Naratip
    A new route for preparing barium zirconate titanate nanoparticles (BaZr<inf>0.3</inf>Ti<inf>0.7</inf>O<inf>3</inf> (BZT)) has been developed by ultrasonication of BaCl<inf>2</inf>·2H<inf>2</inf>O, ZrOCl <inf>2</inf>·8H<inf>2</inf>O and TiCl<inf>4</inf> precursors in a high concentration of NaOH aqueous solution. The as-prepared powders were identified by X-ray diffraction (XRD) as cubic perovskite BZT. The phase formation was confirmed by FT-IR and Raman spectroscopy. The increase of NaOH concentration resulted in BZT powders with smaller particle size and less BaCO<inf>3</inf> contamination. The microstructure of BZT powders prepared in 20 M NaOH examined by scanning electron microscopy (SEM) showed nanosized spherical morphology with the average particle sizes of 51±6 nm. © 2012 Elsevier Ltd and Techna Group S.r.l.
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    Effect of firing temperatures on phase formation and microstructure of Ba(Zr0.3Ti0.7)O3 ceramics prepared via mixed oxide method
    (2009-12-01)
    Bongkarn, Theerachai
    ;
    Phungjitt, Nalinee
    ;
    Vittayakorn, Naratip
    Ba(Zr0.3Ti0.7)O3 (BZT) ceramics were fabricated by a mixed oxide synthetic route. The effect of calcination and sintering temperatures on phase formation and the microstructure of the ceramics were investigated. The pure perovskite phase of BZT powders was obtained with a calcination condition of 1300°C for 4 h. The sintered pellets showed a pure peroverskite cubic phase in all samples. The microstructure of the powders exhibited an almost-spherical morphology and had a porous agglomerated form. The average particle sizes and the average grain sizes were increased from 0.2 to 1.1 μm and 3.9 to 25.1 μm with increasing calcination and sintering temperatures, respectively. The densest and the highest maximum dielectric constant was found in the BZT ceramic sintered at 1550°C. Copyright © Taylor & Francis Group, LLC.