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Author: search.filters.author.Vittayakorn, NaratipSubject: search.filters.subject.barium titanate

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    Item type:Publication,
    BaTiO3/Epoxy Resin Nanocomposites as Flexible Energy Storage Devices
    (2023-01-01)
    Vittayakorn, Wanwilai
    ;
    Tepsansern, Piyapat
    ;
    Kriangkraikul, Worachet
    ;
    Vittayakorn, Naratip
    In this work, nanocomposites between the epoxy resin and barium titanate (BT) were prepared in order to use as flexible energy storage devices. The epoxy resin and BT phase were homogeneously mixed and cast into a disk shape. Phase formation and chemical properties of these nanocomposites were identified via XRD and FTIR methods, respectively. Frequency dependence of dielectric properties for all samples was measured by LCR meter. The polarization hysteresis loops were also investigated in order to calculate the energy density of materials. From the results, it was found that the dielectric constant and loss of these nanocomposites are independent of frequency and the ε<inf>r</inf> and tanδ values tend to increase with increasing BT amount. Moreover, after adding 50% of BT into the system, the energy density of nanocomposites is increased by five times compared with the pure epoxy resin while the energy loss density sharply decreases. The dielectric properties and the energy density of BT/epoxy resin nanocomposites change with BT content and strongly depend on porosity and the distribution of BT nanoparticles.
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    Effects of BiMO3 on dielectric, ferroelectric, and piezoelectric properties of perovskite lead-free piezoelectric BaTiO3–(Bi0.5Na0.5)TiO3 ceramics
    (2017-07-01)
    Chaiyo, Nopsiri
    ;
    Muanghlua, Rangson
    ;
    Vittayakorn, Wanwilai
    ;
    Vittayakorn, Naratip
    New lead-free piezoelectric ceramics of 0.9BaTiO<inf>3</inf>–(0.1−x)(Bi<inf>0.5</inf>Na<inf>0.5</inf>)TiO<inf>3</inf>–xBiMO<inf>3</inf>, M=Al and Ga, where x=0.00-0.10, were fabricated by the solid-state reaction technique. The effect of BiMO<inf>3</inf> contents on the perovskite structure, phase transition, and dielectric, ferroelectric, and piezoelectric properties was investigated. X-ray diffraction patterns showed that the ceramics exhibit a monophasic perovskite phase up to x=0.06, suggesting stabilized perovskite structures with B-site aliovalent substitutions. Compositional-dependent phase transitions were observed from tetragonal to pseudo-cubic phase with increasing BiMO<inf>3</inf> amounts. Al<sup>3+</sup> ions were found to stabilize the transition temperature of the ceramics, while significantly decreasing transition temperature, and a change in the dielectric peak were found with an increasing amount of Ga<sup>3+</sup>. Regarding Al<sup>3+</sup> substitution, the remanent polarization (P<inf>r</inf>) values were found to decrease slightly with the Al<sup>3+</sup> amount. With regard to Ga<sup>3+</sup> substitution, P<inf>r</inf> values decreased with the Ga<sup>3+</sup> amount up to 0.06 and then increased slightly. The ceramics became softer with a higher degree of substitution according to the lower coercive field (E<inf>c</inf>), when compared with 0.9BaTiO<inf>3</inf>–0.1(Bi<inf>0.5</inf>Na<inf>0.5</inf>)TiO<inf>3</inf> ceramics. Ceramics with a lower degree of substitution and tetragonal phase showed butterfly strain loops that correlated with normal ferroelectric behavior.