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Author: search.filters.author.Muanghlua, R.Subject: search.filters.subject.Lead zirconate titanate

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    Effect of annealing on the structure and dielectric properties in PZT-PCoN ceramics
    (2008-01-01)
    Vittayakorn, N.
    ;
    Chaiyo, N.
    ;
    Muanghlua, R.
    ;
    Ruangphanit, A.
    ;
    Vittayakorn, W. C.
    The solid solution between the normal ferroelectric Pb(Zr <inf>1/2</inf>Ti<inf>1/2</inf>)O<inf>3</inf> (PZT) and relaxor ferroelectric Pb(Co<inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf> (PCoN) was synthesized by the solid state reaction method. Sintered PZT-PCoN ceramics were annealed at temperatures ranging from 850 to 1, 100°C for 4 h. X-ray diffraction patterns revealed changes of crystalline structure after annealing, which could be correlated to the accompanied changes in dielectric properties. Furthermore, significant improvements in the dielectric responses were observed in this system. After annealing, a huge increase of up to 200% occurred in the dielectric constants, especially near the temperature of maximum dielectric constant. © 2008 Trans Tech Publications, Switzerland.
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    Effects of Zr/Ti ratio on the structure and ferroelectric properties in PZT-PZN-PMN ceramics near the morphotropic phase boundary
    (2008-01-01)
    Muanghlua, R.
    ;
    Niemchareon, S.
    ;
    Vittayakorn, W. C.
    ;
    Vittayakorn, N.
    The piezoelectric ceramics of Pb(Zr<inf>x</inf>Ti<inf>1-x</inf>)O <inf>3</inf> - Pb(Zn<inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf> - Pb(Mn <inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf>; PZT-PZN-PMN with Zr/Ti ratios of 48/52, 50/50 and 52/48 were fabricated in order to investigate the effect of compositional modifications on the ferroelectric properties of PZT-PZN-PMN ceramics. The phase structure of ceramics sintered at 1,150°C was analyzed. Results show that the pure perovskite phase was in all ceramic specimens, and the phase structure of PZT-PZN-PMN piezoelectric ceramics transformed from tetragonal to rhombohedral, with the Zr/Ti ratios increased in the system. The PZT-PZN-PMN ceramics with a Zr/Ti ratio of 50/50 exhibited the most promising properties including high remanent polarization and low coercive field of 25.95 μC cm<sup>-2</sup> and 12.5 kV cm<sup>-1</sup>, respectively. Furthermore, the transition temperature decreased when the Zr/Ti ratio increased in the system. © 2008 Trans Tech Publications, Switzerland.