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Author: search.filters.author.Chaiyo, NopsiriSubject: search.filters.subject.barium titanate

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    Effects of BiMO3 on dielectric, ferroelectric, and piezoelectric properties of perovskite lead-free piezoelectric BaTiO3–(Bi0.5Na0.5)TiO3 ceramics
    (2017-07-01)
    Chaiyo, Nopsiri
    ;
    Muanghlua, Rangson
    ;
    Vittayakorn, Wanwilai
    ;
    Vittayakorn, Naratip
    New lead-free piezoelectric ceramics of 0.9BaTiO<inf>3</inf>–(0.1−x)(Bi<inf>0.5</inf>Na<inf>0.5</inf>)TiO<inf>3</inf>–xBiMO<inf>3</inf>, M=Al and Ga, where x=0.00-0.10, were fabricated by the solid-state reaction technique. The effect of BiMO<inf>3</inf> contents on the perovskite structure, phase transition, and dielectric, ferroelectric, and piezoelectric properties was investigated. X-ray diffraction patterns showed that the ceramics exhibit a monophasic perovskite phase up to x=0.06, suggesting stabilized perovskite structures with B-site aliovalent substitutions. Compositional-dependent phase transitions were observed from tetragonal to pseudo-cubic phase with increasing BiMO<inf>3</inf> amounts. Al<sup>3+</sup> ions were found to stabilize the transition temperature of the ceramics, while significantly decreasing transition temperature, and a change in the dielectric peak were found with an increasing amount of Ga<sup>3+</sup>. Regarding Al<sup>3+</sup> substitution, the remanent polarization (P<inf>r</inf>) values were found to decrease slightly with the Al<sup>3+</sup> amount. With regard to Ga<sup>3+</sup> substitution, P<inf>r</inf> values decreased with the Ga<sup>3+</sup> amount up to 0.06 and then increased slightly. The ceramics became softer with a higher degree of substitution according to the lower coercive field (E<inf>c</inf>), when compared with 0.9BaTiO<inf>3</inf>–0.1(Bi<inf>0.5</inf>Na<inf>0.5</inf>)TiO<inf>3</inf> ceramics. Ceramics with a lower degree of substitution and tetragonal phase showed butterfly strain loops that correlated with normal ferroelectric behavior.