KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Settings

Author: search.filters.author.Thatawong, BhoowadolSubject: search.filters.subject.energy storage

Search Results

Now showing 1 - 2 of 2
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Effect of Na+ Substitution on the Phase, Microstructure, Electrical and Energy Storage Properties of BSBZNT Ceramics Prepared by the Solid-State Combustion Technique
    (2023-01-01)
    Chongsatan, Wistsarut
    ;
    Didpim, Ratirom
    ;
    Julphunthong, Phongthorn
    ;
    Thatawong, Bhoowadol
    ;
    Vittayakorn, Naratip
    (Ba<inf>0.704</inf>Sr<inf>0.176</inf>Bi<inf>0.12</inf>)<inf>1-x</inf>Zn<inf>0.08</inf>Nb<inf>0.04</inf>Ti<inf>0.88</inf>O<inf>3</inf>-Na<inf>x</inf> (BSBZNT-xNa) ceramics with x = 0, 0.01, 0.03 and 0.05 mol%, were prepared by the solid-state combustion technique. The samples were calcined and sintered at 950 °C and 1375 °C, respectively, for 2 h. The phase, microstructure, dielectric, ferroelectric and energy storage properties were investigated. The X-ray diffraction patterns of the BSBZNT-xNa powders showed a perovskite phase for all samples. When x increased from 0-0.03, the average particle size increased from 380 to 480 nm, then decreased to 420 nm. All sintered samples showed the coexistence of the orthorhombic and cubic phases. The average grain size was in the range of 2.03 to 1.39 µm. The BSBZNT-0.01Na ceramic exhibited the highest dielectric properties at room temperature (ɛ<inf>r</inf> = 902, tanδ = 0.10), the lowest remanent polarization (P <inf>r</inf> = 0.10 µC/cm<sup>2</sup>), coercive field (E <inf>c</inf> = 0.43 kV/cm), and the highest energy storage efficiency (η ∼ 94.70%) measured under an electric field of 70 kV/cm.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Item,
    Phase Formation, Morphology and Electrical Properties of Lead-Free BNBLT-xBSN Ceramics Synthesized via the Solid-State Combustion Technique
    (2023-01-01)
    Thatawong, Bhoowadol
    ;
    Vittayakorn, Naratip
    ;
    Rittidech, Aurawan
    ;
    Bongkarn, Theerachai
    Lead-free 1-x(Bi<inf>0.47</inf>Na<inf>0.47</inf>Ba<inf>0.06</inf>)<inf>0.95</inf>La<inf>0.05</inf>TiO<inf>3</inf>-xBa(Sn<inf>0.70</inf>Nb<inf>0.24</inf>)O<inf>3</inf> (BNBLT-xBSN) ceramics with x = 0, 0.01, 0.02, 0.03 and 0.04 mol.% were synthesized by the solid-state combustion technique with a calcination temperature of 750 °C for 2 h and a sintering temperature of 1150 °C for 2 h. The effect of BSN substitution on the phase formation, microstructure, dielectric, ferroelectric and energy storage properties of the BNBLT ceramics was investigated. With the substitution of BSN, the coexisting rhombohedral (R) and tetragonal (T) phases transformed into coexisting R and cubic (C) phase, verified by Rietveld refinement. The C phase increased with increased BSN content. The average grain size decreased from 1.14 to 0.89 µm when x increased to 0.03 and then increased to 0.96 µm. The measured density and maximum dielectric constant (ε <inf>m</inf>) tended to increase from 5.44 to 5.87 g/cm<sup>3</sup> and 1800 to 1942 when x increased to 0.03, then decreased to 5.25 g/cm<sup>3</sup> and 1501, respectively. The remanent polarization (P <inf>r</inf>) and coercive field (E <inf>c</inf>) decreased when x increased to 0.03. The 0.97BNBLT-0.03BSN ceramic exhibited the lowest energy loss density (W <inf>loss</inf> ∼ 0.10 J/cm<sup>3</sup>) and the highest energy-storage efficiency (η ∼ 77.3%) measured under an electric field of 70 kV/cm.