Sukkha, Usa

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Sukkha, Usa
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usa.suk@kmitl.ac.th

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    High piezoelectric response in lead free 0.9BaTiO3-(0.1-x)CaTiO3-xBaSnO3 solid solution
    (2017-08-01)
    Mayamae, Jitkasem
    ;
    Vittayakorn, Wanwilai
    ;
    Sukkha, Usa
    ;
    Bongkarn, Theerachai
    ;
    Muanghlua, Rangson
    Lead free piezoelectric in the ternary system of 0.9BaTiO<inf>3</inf>-(0.1-x)CaTiO<inf>3</inf>-xBaSnO<inf>3</inf> [BCT-xBS], where x = 0.00–0.075, was fabricated via a conventional solid state reaction. The effect of substituting BCT with BS on the crystal structure as well as dielectric, ferroelectric and strain behavior was investigated systematically in order to search for outstanding actuating performances in lead free piezoelectric ceramics. A ferroelectric phase diagram of BT-CT-BS was established in this work, and a multi-ferroelectric phase composition was designed near ambient temperature, based on an established phase diagram. The BS substitute depressed the ferroelectric-paraelectric phase temperature slightly and raised the transition temperatures of O-T phase transformations, thus, the orthorhombic phase could be stabilized above the ambient temperature with x > 0.05. As a result, the polymorphic phase composition showed outstanding piezoelectric values of k<inf>p</inf> = 41.7%, d<inf>33</inf> = 469 pC/N and d<inf>33</inf><sup>*</sup> = 1335 pm/V@10 kV/cm, which are suitable for lead free piezoelectric actuator applications.
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    Dielectric, ferroelectric and piezoelectric properties of the lead free 0.9BaTiO3-(0.1- x)Bi0.5Na0.5TiO3- x Bi(Mg0.5Ti0.5)O3 solid solution
    (2016-01-02)
    Mayamae, Jitkasem
    ;
    Sukkha, Usa
    ;
    Niemchareon, Surasak
    ;
    Muanghlua, Rangson
    ;
    Vittayakorn, Naratip
    Solid solution of 0.9BaTiO<inf>3</inf>-(0.1-x)Bi<inf>0.5</inf>Na<inf>0.5</inf>TiO<inf>3</inf>-xBi(Mg<inf>0.5</inf>Ti<inf>0.5</inf>)O<inf>3</inf> (BT-BNT-xBMT) system, where x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10, was synthesized by the solid state reaction. Dense BT-BNT-xBMT ceramics were obtained by sintering at 1,150-1,250C for 4 h. The effect of BMT on crystal structure and electrical property of BT-BNT ceramics was investigated as a function of composition, x, using X-ray diffraction, dielectric spectroscopy, hysteresis and strain measurements. The crystal structure of solid solution BT-BNT-xBMT, where x = 0.00-0.10, successively transforms from tetragonal to pseudocubic symmetry, with increased BMT concentration. Temperature dependence of dielectric constant (ε<inf>r</inf>) and dielectric loss (tanδ) for BT-BNT-xBMT at various frequencies showed that phase transition of ceramics changed from ferroelectric to relaxor-like behavior as BMT content increased. Furthermore, remanent polarization (P<inf>r</inf>), coercive field (E<inf>c</inf>) and the normalized strain (d<inf>33</inf>∗) of BT-BNT-xBMT ceramics tend to decrease with increasing BMT concentration.