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Access type: UnknownSubject: 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.
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    Mechanical property evaluation of PZT/Al2O3 composites prepared by a simple solid-state mixed oxide method
    (2006-06-01)
    Puchmark, C.
    ;
    Rujijanagul, G.
    ;
    Jiansirisomboon, S.
    ;
    Tunkasiri, T.
    ;
    Vittayakorn, N.
    Ferroelectric lead zirconate titanate (PZT) based composites containing nanoparticles of Al<inf>2</inf>O<inf>3</inf> were prepared by a simple solid-state mixed oxide method. The sintering procedure was carried out at 1200 °C for 2 h with a heating/cooling rate of 5 °C/min. Phase formation and microstructure were examined by XRD and SEM, respectively. The effects of the Al<inf>2</inf>O<inf>3</inf> additive on hardness were investigated. Hardness was determined using a Vickers indentation technique and evaluated as a function of Al<inf>2</inf>O<inf>3</inf> volume fraction between 0% and 2%. The hardness of the composites tended to improve with the addition of the nanoparticles. The maximum hardness was obtained at PZT/1 vol.% Al<inf>2</inf>O<inf>3</inf>. The hardness results are related to the microstructure and compared with previous results reported by others. © 2005 Elsevier B.V. All rights reserved.