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Subject: search.filters.subject.barium titanate

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    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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    Effect of Piezoelectric Phase on Electrical Properties of PDMS-Based Nanocomposites
    (2021-01-01)
    Kongjaiman, Patiparn
    ;
    Yunsamarn, Preedaporn
    ;
    Vittayakorn, Wanwilai
    In this work, nanocomposite between polydimethylsiloxane (PDMS) and barium titanate (BT) are prepared in order to use as piezoelectric nanogenerator. Barium titanate phase with various amounts and shapes such as nanoparticles and nanowires are synthesized via appropriated methods. The PDMS and BT phases are homogeneously mixed and casted into 3 cm x 4 cm rectangle. Phase formation, chemical property and microstructure of these nanocomposites are identified via XRD, FTIR and SEM methods, respectively. Both frequency and temperature dependences of dielectric properties for all samples are measured by LCR meter. The piezoelectric properties of these nanocomposites are performed by study the generated output voltage and current after applying the mechanical force to the samples. From those results, it is concluded that the electrical properties of these BT/PDMS nanocomposites strongly depend on amounts and forms of piezoelectric filler. The orientation of polarization within the BT crystal shows an important role for piezoelectric properties of these nanocomposites.
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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.