Structural, microstructure and electrical properties of La2O3-doped Bi0.5(Na0.68K0.22Li0.1)0.5TiO3 lead-free piezoelectric ceramics synthesized by the combustion technique

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dc.contributor.authorBhupaijit, Pamornnarumol
dc.contributor.authorKornphom, Chittakorn
dc.contributor.authorVittayakorn, Naratip
dc.contributor.authorBongkarn, Theerachai
dc.date.accessioned2026-08-06T10:11:48Z
dc.date.available2026-08-06T10:11:48Z
dc.date.issued2015-07-01
dc.description.abstractThe effect of firing temperatures on phase formation, microstructure and physical properties of [Bi<inf>0.5</inf>(Na<inf>0.68</inf>K<inf>0.22</inf>Li<inf>0.1</inf>)<inf>0.5</inf>TiO<inf>3</inf>] doped with La<inf>2</inf>O<inf>3</inf> at 0.1 wt% (BNKLLT) ceramics prepared by the combustion method was studied. Glycine was used as fuel and the ratio of raw material (corresponding oxidant metal nitrate) with fuel was about 1:0.56. The samples were calcined at 600-900 °C for 2 h and sintered at 1075-1150 °C for 2 h. The single rhombohedral peroveskite phase of BNKLLT powders was observed from the sample calcined at 750 °C for 2 h. The BNKLLT ceramics exhibited a pure peroveskite phase in all samples. The microstructures of the BNKLLT powders exhibited an agglomerated form while the grain ceramics exhibited a square shape. The average particle size and average grain size increased with increasing firing temperatures. The density, dielectric constant (ε<inf>r</inf> and ε<inf>m</inf>), P<inf>r</inf> and d<inf>33</inf> tended to increase with increasing sintering temperatures up to 1100 °C and then decreased. The maximum density (5.73 g/cm<sup>2</sup>), maximum dielectric constant (ε<inf>r</inf>~2572 and ε<inf>m</inf>~5536), good ferroelectric properties (P<inf>r</inf>~35.78 μC/cm<sup>2</sup> and E<inf>c</inf>~22.42 kV/cm) and highest d<inf>33</inf> (210 pC/N) were obtained by the sample sintered at 1100 °C for 2 h.
dc.identifier.citationCeramics International, 41(S1), S81-S86, 2015
dc.identifier.doi10.1016/j.ceramint.2015.03.226
dc.identifier.issn02728842
dc.identifier.other2-s2.0-84937514529
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/6307
dc.sourceCeramics International
dc.subjectCombustion technique
dc.subjectDielectric
dc.subjectFerroelectric
dc.subjectPerovskite structure
dc.subjectPiezoelectric
dc.titleStructural, microstructure and electrical properties of La2O3-doped Bi0.5(Na0.68K0.22Li0.1)0.5TiO3 lead-free piezoelectric ceramics synthesized by the combustion technique
dc.typeConference Paper

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