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Author: search.filters.author.Pengpat, KamonpanSubject: search.filters.subject.Dielectric

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    Effect of Ba0.93Ca0.04La0.03Sn0.1Ti0.9O3 addition on structural and electrical properties of lead-free 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 piezoelectric ceramics
    (2025-12-01)
    Kantha, Puripat
    ;
    Unruan, Muangjai
    ;
    Tunkasiri, Tawee
    ;
    Pengpat, Kamonpan
    ;
    Sukkha, Usa
    The doping of other materials into the structure of BCZT ceramics can improve the electrical properties. The lead-free piezoelectric ceramics in the (1-x)BCZT–xBCLST binary system, where x = 0.00, 0.01, 0.03, 0.05, and 0.07 mol, were synthesized using a two-step mixed oxide method. Initially, pure phases of 0.5Ba(Zr<inf>0.2</inf>Ti<inf>0.8</inf>)O<inf>3</inf>-0.5(Ba<inf>0.7</inf>Ca<inf>0.3</inf>)TiO<inf>3</inf> (BCZT) and Ba<inf>0.93</inf>Ca<inf>0.04</inf>La<inf>0.03</inf>Sn<inf>0.1</inf>Ti<inf>0.9</inf>O<inf>3</inf> (BCLST) powders were separately prepared by mixed oxide and conventional solid-state reaction methods. X-ray diffraction patterns and Ti K-edge X-ray Absorption Near-Edge Structure (XANES) spectra revealed structural distortions in BCLST-doped ceramics. The electrical properties including dielectric, piezoelectric, and ferroelectric properties were evaluated. Besides, the dielectric constant and dielectric loss at room temperature of BCZT–BCLST ceramics were enhanced with increasing BCLST content. The dielectric properties at room temperature improved with increasing BCLST concentration from x = 0.00 to x = 0.03 mol, with the maximum dielectric constant rising from 1408 to 2552—an increase of approximately 81 %. The hysteresis P–E loop of BCZT–BCLST ceramics exhibited a slim loop, with a maximum remanent polarization (P<inf>r</inf>) of 7.22 μC/cm<sup>2</sup> observed at x = 0.03 mol. The optimal doping condition for BCLST in BCZT ceramics was found at 0.03 mol, yielding the highest piezoelectric coefficient (d<inf>33</inf>) of 235 pC/N—an improvement of approximately 9 % compared to the undoped sample (x = 0.00).
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    The electrical properties of lanthanide doped potassium sodium lithium niobate based silicate glass
    (2021-05-19)
    Yongsiri, Ploypailin
    ;
    Sattayapom, Suchinda
    ;
    Senanon, Wipada
    ;
    Pengpat, Kamonpan
    In this work, the electrical properties of ferroelectric glass-ceramics in the system of 75((K0.5Na0.5)0.94Li0.06)1-xErxNbO3 - 25SiO2 (75KNLNxEr - 25SiO2) with x varying between 0.005-0.01 mol% have been investigated. The Er2O3 is a lanthanide element that was found to promote the electrical and optical properties in many materials. The data from XRD pattern showed that the prepared glass-ceramics contained crystals of KNLNxEr solid solution, and the crystallite size slightly increased when increasing heat treatment temperature. For dielectric constant and dielectric loss at room temperature, the maximum values of about 304 at 1MHz with a dielectric loss below 0.01 was found in glass-ceramics without Er2O3 dopant. The dielectric value can be raised to 1750 in glass doped with 0.005 mol% of Er2O3 when the measurement temperature is increased. Finally, the oxidation states of glass-ceramics confirm by XANES showed that Er2O3 dopant was Er trivalent cations, and the erbium ions were not precipitated in oxide form.
      1