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Author: search.filters.author.Bhupaijit, PamornnarumolSubject: search.filters.subject.piezoelectric

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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.
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    Dielectric and piezoelectric properties near the morphotropic phase boundary for 0.94BNT-0.06BT ceramics synthesized by the solid-state combustion technique
    (2021-01-01)
    Thatawong, Bhoowadol
    ;
    Bhupaijit, Pamornnarumol
    ;
    Lamyai, Yanwarood
    ;
    Vittayakorn, Naratip
    ;
    Bongkarn, Theerachai
    Ceramics of 0.94Bi<inf>0.5</inf>Na<inf>0.5</inf>TiO<inf>3</inf>-0.06BaTiO<inf>3</inf> (0.94BNT-0.06BT) were synthesized by the solid-state combustion technique with various calcination and sintering temperatures (600-800 °C and 1100-1200 °C). A pure perovskite phase was obtained from the powder calcined at 750 °C for 2 h. The phase structure, microstructure, dielectric, ferroelectric and piezoelectric properties of the 0.94BNT-0.06BT ceramics were investigated. The XRD patterns showed coexisting phases of rhombohedral (R) and tetragonal (T) in all samples. Moreover, a good R:T phase ratio of 53:47, as found by Rietveld refinement, good grain growth and high density (5.84 g/cm<sup>3</sup>) were found with a sintering temperature of 1150 °C for 2 h. An excellent maximum dielectric constant (ε<inf>m</inf> = 8405), good ferroelectric properties (P<inf>r</inf> = 28.2 µC/cm<sup>2</sup> and E<inf>c</inf> = 22.1 kV/cm) and a high piezoelectric coefficient (161 pC/N) were observed in this sample, which was near a morphotropic phase boundary (MPB).