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Author: search.filters.author.Huang, Chien Chih

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    Phase transitional behavior and dielectric properties of lead free (1-x)(K0.5Na0.5)NbO3-xBi (Zn0.5Ti0.5)O3 ceramics
    (2009-06-24)
    Sutapun, Manoon
    ;
    Huang, Chien Chih
    ;
    Cann, David P.
    ;
    Vittayakorn, Naratip
    Lead-free ceramics based on potassium sodium niobate [(K<inf>0.5</inf>Na<inf>0.5</inf>)NbO<inf>3</inf>; KNN]-bismuth zinc titanate [Bi(Zn<inf>0.5</inf>Ti<inf>0.5</inf>)O<inf>3</inf>; BZT] were prepared by the modified-conventional mixed oxide route with normal sintering. The crystal structure and ferroelectric phase transitions were studied by means of X-ray diffraction, thermal and dielectric measurements. The ceramics with perovskite structure were in orthorhombic phase at x ≤ 0.010. When reaching 0.01 < x ≤ 0.03, they became a rhombohedral perovskite structure; and with increasing BZT content, cubic within the studied composition range. The phase Bi<inf>2</inf>Ti<inf>2</inf>O<inf>7</inf> with cubic structure began to appear at x > 0.25 and became dominant while increasing the content of BZT. Furthermore, the phase transition temperature of orthorhombic-tetragonal (T<inf>O-T</inf>) and tetragonal-cubic (T<inf>C</inf>) decreased when a small amount of BZT was added. As the amount of BZT concentration increased, the structure became denser, and well developed grain morphology with almost no porosity was finally obtained. © 2008 Elsevier B.V. All rights reserved.
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    Phase transitions and dielectric properties in Bi(Zn1/2Ti 1/2)O3-(Na1-yLiy)NbO3 perovskite solid solutions
    (2009-03-01)
    Huang, Chien Chih
    ;
    Vittayakorn, Naratip
    ;
    Prasatkhetragarn, Anurak
    ;
    Gibbons, Brady J.
    ;
    Cann, David P.
    Perovskite solid solutions based on the system Bi(Zn<inf>1/2</inf>Ti <inf>1/2</inf>)O<inf>3</inf>-NaNbO<inf>3</inf> were obtained via solid-state processing techniques. The crystal structure and ferroelectric phase transitions were studied by means of X-ray diffraction and dielectric measurements. A stable perovskite phase was obtained for Bi(Zn<inf>1/2</inf>Ti <inf>1/2</inf>)O<inf>3</inf> substitutions up to 10mol%. The dielectric characterization revealed that as the Bi(Zn<inf>1/2</inf>Ti<inf>1/2</inf>)O <inf>3</inf> content increased, the transition temperature decreased and the transition peak became very diffuse. The polarization hysteresis loop and strain measurements presented evidence of an induced ferroelectric phase with 1 mol % Bi(Zn<inf>1/2</inf>Ti<inf>1/2</inf>)O<inf>3</inf> substitutions. The planar coupling factor (k<inf>p</inf>) for 0.01Bi(Zn<inf>1/2</inf>Ti <inf>1/2</inf>)O<inf>3</inf>-0.99NaNbO<inf>3</inf> was measured to be 0.28. In addition, with the substitution of Li for Na in the Bi(Zn<inf>1/2</inf>Ti <inf>1/2</inf>)O<inf>3</inf>-(Na<inf>1-y</inf>Li<inf>y</inf>)NbO<inf>3</inf> system, the diffuseness of the transition peak decreased and the transition temperature increased. © 2009 The Japan Society of Applied Physics.
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    Dielectric properties of Pb[(1-x)(Zr1/2Ti1/2)- x(Zn1/3Ta2/3)]O3 ceramics prepared by columbite and wolframite methods
    (2008-06-01)
    Banlue, Wanwimon
    ;
    Vittayakorn, Naratip
    ;
    Huang, Chien Chih
    ;
    Cann, David P.
    Polycrystalline samples of Pb[(1 - x)(Zr<inf>1/2</inf>Ti<inf>1/2</inf>) - x(Zn<inf>1/3</inf>Ta<inf>2/3</inf>)]O <inf>3</inf> , where x = 0.1-0.5 were prepared by the columbite and wolframite methods. The crystal structure, microstructure, and dielectric properties of the sintered ceramics were investigated as a function of composition via X-ray diffraction (XRD), scanning electron microscopy (SEM), and dielectric spectroscopy. The results indicated that the presence of Pb(Zn<inf>1/3</inf>Ta<inf>2/3</inf>)O<inf>3</inf> (PZnTa) in the solid solution decreased the structural stability of overall perovskite phase. A transition from tetragonal to pseudo-cubic symmetry was observed as the PZnTa content increased and a co-existence of tetragonal and pseudo-cubic phases was observed at a composition close to x = 0.1. Examination of the dielectric spectra indicated that PZT-PZnTa exhibited an extremely high relative permittivity at the MPB composition. The permittivity showed a ferroelectric to paraelectric phase transition at 330 °C with a maximum value of 19,600 at 100 Hz at the MPB composition. © 2008 Springer Science+Business Media, LLC.
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    Phase transitions and ferroelectric properties in BiScO3 -Bi (Zn12 Ti12) O3 -BaTiO3 solid solutions
    (2007-09-10)
    Huang, Chien Chih
    ;
    Cann, David P.
    ;
    Tan, Xiaoli
    ;
    Vittayakorn, Naratip
    Ceramics solid solutions within the ternary perovskite system Bi (Zn12 Ti12) O3 -BiScO3 -BaTiO3 were synthesized via solid-state processing techniques. The crystal structure of sintered ceramics was analyzed by x-ray diffraction. A stable perovskite phase was obtained for all compositions with a BaTiO3 content greater than 50 mol %. Furthermore, a change in symmetry from pseudocubic to tetragonal was observed as the mole fraction of BaTiO3 increased. Dielectric measurements show a dielectric anomaly associated with a phase transformation over the temperature range of 30 °C-210 °C for all compositions. Examination of the polarization hysteresis behavior revealed weakly nonlinear hysteresis loops. With these data, ferroelectric phase diagrams were derived showing the transition between the pseudocubic relaxor behavior to the tetragonal normal ferroelectric behavior. This transition was also correlated with changes in the diffuseness parameter. © 2007 American Institute of Physics.