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Author: search.filters.author.Niemcharoen, SurasakSubject: search.filters.subject.Dielectric properties

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    Effect of A-site and B-site ion replaced with small ions on the intermediate phase in PbZrO3 ceramic
    (2014-02-14)
    Sukkha, Usa
    ;
    Vittayakorn, Wanwilai
    ;
    Muanghlua, Rangson
    ;
    Niemcharoen, Surasak
    ;
    Vittayakorn, Naratip
    The solid solution of (1 - x)PbZrO<inf>3</inf>-xNaNbO<inf>3</inf> ceramics, where x = 0.0-0.08, was synthesized by solid state reaction. The basic characterizations were performed using X-ray diffraction (XRD), dielectric spectroscopy, hysteresis measurement and differential scanning calorimetry (DSC) techniques. The results indicated that the crystal structure of the solid solution, (1 - x)PZ-xNN, where x = 0.00-0.08, is of orthorhombic symmetry. It was found that the effect of NN being replaced with small ions at the A-site and B-site can induce an AFE-like phase in PZ. The FE intermediate phase of PZ cannot be induced, although Zr<sup>4+</sup> ions were substituted by small Nb<sup>5+</sup> ions. This is due to the decreasing average rate of radii in the A-site (0.1 Å mol<sup>-1</sup>) being higher than that in the B-site (0.08 Å mol<sup>-1</sup>). © 2013 Elsevier B.V. All rights reserved.
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    Synthesis, characterization and dielectric properties of Mn(2-x)znxP2O7 ceramics
    (2013-10-29)
    Sutapun, Manoon
    ;
    Muanghlua, Rangson
    ;
    Niemcharoen, Surasak
    ;
    Vittayakorn, Wanwilai C.
    ;
    Seeharaj, Panpailin
    Manganese zinc pyrophosphate (Mn<inf>(2-x)</inf>Zn<inf>x</inf>P<inf>2</inf>O<inf>7</inf> when x = 0.0, 0.5, 1.0, 1.5 and 2.0) ceramics were fabricated by conventionally mixing oxide using the normal sintering method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR), Raman spectroscopy and scanning electron microscopy (SEM). The XRD results indicated that synthesized Mn<inf>(2-x)</inf>Zn<inf>x</inf>P<inf>2</inf>O<inf>7</inf> systems have a pure monoclinic phase without the presence of phase impurities. The lattice parameters and crystalline sizes analyzed from XRD data were changed depending on the amount of added Zn<sup>2+</sup> ion concentration in the Mn<inf>2</inf>P<inf>2</inf>O<inf>7</inf> structure. The FT-IR and Raman results showed the fundamental vibrations of P<inf>2</inf>O<inf>7</inf> <sup>4-</sup> ion and Mn-O or Zn-O, which confirmed the Mn<inf>(2-x)</inf>Zn<inf>x</inf>P<inf>2</inf>O<inf>7</inf> formation. In addition, dielectric stability of temperature and frequency was observed in the composition, x = 1.0, with a dielectric constant value of 11.5 at 1 MHz. © (2013) Trans Tech Publications, Switzerland.
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    Phase transition behaviour and electrical properties of lead-free (K 0.5Na0.5)NbO3-LiNbO3-LiSbO 3 piezoelectric ceramics
    (2011-05-01)
    Muanghlua, Rangson
    ;
    Niemcharoen, Surasak
    ;
    Sutapun, Manoon
    ;
    Boonchom, Banjong
    ;
    Vittayakorn, Naratip
    The ternary system of 0.945(K<inf>0.5</inf>Na<inf>0.5</inf>NbO <inf>3</inf>)-(0.055 - x)LiNbO<inf>3</inf>-xLiSbO<inf>3</inf> [0.945KNN-(0.055 - x)LN-xLS]; x = 0.0-0.055 lead-free piezoelectric ceramics was fabricated by the conventional mixed oxide method with normal sintering. The crystal structure was studied by means of X-ray diffraction (XRD). The results of XRD patterns show that complete solid solutions of the mixed phase between the orthorhombic and tetragonal perovskite phase were observed. The DSC and dielectric data show that the amount of LiSbO<inf>3</inf> in K<inf>0.5</inf>Na<inf>0.5</inf>NbO <inf>3</inf>-LiNbO<inf>3</inf> solid solution slightly decreases the paraelectric cubic-ferroelectric tetragonal phase transition (T<inf>C</inf>) to a low temperature. Furthermore, good dielectric and piezoelectric properties were observed at composition, x = 0.03. The polymorphic phase transition between the orthorhombic and tetragonal phases plays a very important role in enhancement of the piezoelectric properties of KNN-LN-LS ceramics. © 2010 Elsevier B.V. All rights reserved.
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    Structure and dielectric properties of Bi0.5K 0.5TiO3-SrTiO3 lead-free ceramics
    (2011-01-01)
    Ruangphanit, Anucha
    ;
    Phetnoi, Prapapim
    ;
    Niemcharoen, Surasak
    ;
    Muanghlua, Rangson
    Bismuth potassium titanate - strontium titanate (1-x)Bi<inf>0.5</inf>K <inf>0.5</inf>TiO<inf>3</inf>-(x)SrTiO<inf>3</inf> (BKT-ST) lead-free ceramics when x = 0-0.20 were synthesized by the solid state reaction method with normal sintering. The ferroelectric phase transition was studied by X-ray diffraction (XRD). All compositions showed a single phase perovskite structure with tetragonal symmetry at room temperature and the phase structure transformed from ferroelectric tetragonal - paraelectric cubic in the range of x ≥ 0.10. Dielectric study revealed that the dielectric relaxor behavior was induced with increasing ST and transition temperature (T<inf>m</inf> ε<inf>r max</inf>) of ST-doped BKT had a tendency to decrease with increasing ST. The Bi <inf>0.5</inf>K<inf>0.5</inf>TiO<inf>3</inf>-SrTiO<inf>3</inf> system was expected to be a new and promising candidate for lead-free capacitors. © (2011) Trans Tech Publications.
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    Preparation and properties of lead free bismuth sodium titanate-bismuth zinc titanate ceramics
    (2009-12-01)
    Muanghlua, Rangson
    ;
    Niemcharoen, Surasak
    ;
    Vittayakorn, Wanwilai C.
    ;
    Tungsitvisetkul, Nattapong
    ;
    Chinwaro, Pimjan
    Lead-free piezoelectric ceramics based on (1-x)Bi1/2Na1/2TiO3 - x Bi(Zn1/2 Ti1/2)O3 (x = 0.0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.20, 0.30, 0.40, and 0.5) were obtained via solid-state processing techniques. The influence of BZT addition on BNT characteristics, sintering, microstructure and properties was investigated. A single perovskite phase with rhombohedral symmetry was obtained for Bi(Zn1/2Ti1/2)O3 substitutions of up to 10 mole%. A small amount of BZT was effective for improving both sintering behavior and dielectric properties of BNT ceramics. Optimized dielectric properties were obtained for samples with a maximum density of ρ = 98.3% for the composition, x = 0.1. Copyright © Taylor & Francis Group, LLC.