Boonchom, Banjong

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Boonchom, Banjong
Alternative Name
BOONCHOM, Banjong
Boonchom, B.
Boonchom, And Banjong
Boonchoma, Banjong
Boomchom, Banjong
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Email
banjong.bo@kmitl.ac.th

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    The phase evolution with temperature in 0.94PbZrO3-0. 06Pb(Mg1/2W1/2)O3 antiferroelectric ceramic
    (2010-09-10)
    Charoonsuk, Piyanut
    ;
    Wirunchit, Supamas
    ;
    Muanghlua, Rangson
    ;
    Niemcharoen, Surasak
    ;
    Boonchom, Banjong
    The perovskite structure of the lead zirconate-lead magnesium tungstate ceramic, 0.94PbZrO<inf>3</inf>-0.06Pb(Mg<inf>1/2</inf>W<inf>1/2</inf>)O <inf>3</inf> (0.94PZ-0.06PMW), was prepared by the wolframite precursor method. The phase evolution with temperature in the 0.94PZ-0.06PMW ceramic was investigated, with dielectric permittivity, differential scanning calorimetry and polarization measurements. The ceramic was in the antiferroelectric phase when below 177 °C, based on dielectric measurement, and an intermediate phase was detected between 177 and 219 °C. Evidence from ferroelectric data was found to suggest that this intermediate phase is ferroelectric. © 2010 Elsevier B.V. All rights reserved.
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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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    Aqueous Co-precipitated spherical shape PbZrO3 nanopowders: Perovskite phase formation
    (2013-05-01)
    Charoonsuk, Piyanut
    ;
    Vittayakorn, Wanwilai
    ;
    Muanghlua, Rangson
    ;
    Boonchom, Banjong
    ;
    Niemcharoen, Surasak
    The perovskite phase formation of nanocrystalline powder of lead zirconate (PbZrO<inf>3</inf>, PZ) was investigated. The structure, phase formation and morphology of PZ powders were characterized using the X-ray diffraction technique (XRD), Fourier transform infrared (FT-IR) spectroscopy, Raman spectroscopy, transmission electron microscope (TEM) and differential scanning calorimetry (DSC). Tetragonal zirconia (t-ZrO<inf>2</inf>) phase was found as an intermediate phase during the calcinations process, followed by the crystallization of the orthorhombic PZ phase. The change in relative amount of the residual t-ZrO<inf>2</inf> phase as a function of calcination temperature was estimated from the relative intensities of selected Raman peaks. From a TEM photograph, the PbZrO<inf>3</inf> powder was found to be spherical in shape with uniform nanosized features. The average particle size for the calcined powders was about 10.44±1.21 nm. © 2012 Elsevier Ltd and Techna Group S.r.l.
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    Dielectric properties and phase transition behaviors in (1-x) PbZrO3 -xPb (Mg1/2 W1/2) O3 ceramics
    (2009-10-09)
    Vittayakorn, Naratip
    ;
    Charoonsuk, Piyanut
    ;
    Kasiansin, Panisara
    ;
    Wirunchit, Supamas
    ;
    Boonchom, Banjong
    The solid solution of lead zirconate [PbZrO3 (PZ)] and lead magnesium tungstate [Pb (Mg1/2 W1/2) O<sup>3</sup> (PMW)] has been synthesized by the wolframite precursor method. The crystal structure, phase transformations, dielectric and thermal properties of (1-x) PZ-xPMW, where x=0.00-0.10, were investigated. The crystal structure of sintered ceramics was analyzed by x-ray diffraction. Phase-pure perovskite was obtained for all compositions. Furthermore, a change from orthorhombic to rhombohedral symmetry was observed as the mole fraction of increased PMW. As a result, it was found that PbZrO <sup>3</sup> -Pb (Mg1/2 W1/2) O<sup>3</sup> undergoes successive transitions from the antiferroelectric phase to the ferroelectric phase to the paraelectric state. The coexistence of orthorhombic and rhombohedral phases in this binary system is located near the composition x=0.1. © 2009 American Institute of Physics.