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Author: search.filters.author.Sinkruason, ThanaponSubject: search.filters.subject.dielectric

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    Phase formation and electrical properties of SBNLT ceramics prepared via combustion technique
    (2023-01-01)
    Sinkruason, Thanapon
    ;
    Luangpangai, Anupong
    ;
    Charoenthai, Nipaphat
    ;
    Rittidech, Aurawan
    ;
    Pulphol, Phieraya
    This report investigates the effect of firing temperatures on the phase formation, microstructure, electrical, and energy storage properties of lead-free Sr<inf>0.3</inf>(Bi<inf>0.7</inf>Na<inf>0.67</inf>Li<inf>0.03</inf>)<inf>0.5</inf>TiO<inf>3</inf> (SBNLT) ceramics, synthesised by combustion technique. The samples were calcined between 700°C and 900°C for 2 h and sintered between 1100°C and 1200°C for 2 h. The ceramics exhibited coexisting rhombohedral and tetragonal phases, which were confirmed by the Rietveld refinement technique. A morphotropic phase boundary (MPB) of the rhombohedral and tetragonal phases, with a ratio of 49:51, was obtained at the sintering temperature of 1175°C. The highest maximum dielectric constant (ε <inf>max</inf>= 4667), polarisation (P <inf>max</inf>= 28.80 µC/cm<sup>2</sup>) and energy density (W = 0.95 J/cm<sup>3</sup>), with a breakdown strength of 70 kV/cm, were achieved from the sample sintered at 1175°C.
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    Phase formation, microstructure and electrical properties of Ba0.9Ca0.1TiO3 ceramics fabricated via the solid-state combustion technique
    (2022-01-01)
    Sonchaopri, Nutkamon
    ;
    Bhupaijit, Pamornnarumol
    ;
    Yotthuan, Surirat
    ;
    Sinkruason, Thanapon
    ;
    Premwichit, Pathit
    In this research, the effects of calcination temperature in a range of 1050–1200 °C for 2 h and sintering temperature in a range of 1325-1400 °C for 2 h on phase formation, microstructure and electrical properties of lead-free Ba<inf>0.9</inf>Ca<inf>0.1</inf>TiO<inf>3</inf> (BCT) ceramics fabricated via the solid-state combustion technique were investigated. For the XRD result, all the ceramics exhibited a coexisting phase between tetragonal and orthorhombic. The ceramic grain size tended to increase with increase of the sintering temperature. For BCT ceramic produced by the optimum sintering temperature (1375 °C for 2 h), the dielectric, ferroelectric and piezoelectric properties of ε <inf>C</inf>=7393, P <inf>r</inf>=7.60 μC/cm<sup>2</sup><inf>,</inf> E <inf>C</inf>=5.99 kV/cm and d <inf>33</inf>=158 pC/N, respectively, were obtained.