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    Item type:Publication,
    Preface
    (2021-09-20)
    Thammavintorn, Preecha
    ;
    Limkaisang, Viroj
    ;
    Charoenprakdee, Anek
    ;
    Seetawan, Tosawat
    ;
    Kimura, Kaoru
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    Synthesis and properties of Pb(Co1/3Nb2/3)O3 ceramics
    (2008-10-20)
    Unruan, Muangjai
    ;
    Vittayakorn, Naratip
    ;
    Wongmaneeruang, Rewadee
    ;
    Prasatkhetragarn, Anurak
    ;
    Ananta, Supon
    In this study, Pb(Co<inf>1/3</inf>Nb<inf>2/3</inf>)O<inf>3</inf> or PCN ceramics have been produced by sintering PCN powders synthesized from lead oxide (PbO) and cobalt niobate (CoNb<inf>2</inf>O<inf>6</inf>) with an effective method developed for minimizing the level of PbO loss during sintering. Attention has been focused on relationships between sintering conditions, phase formation, density, microstructural development, dielectric and ferroelectric properties of the sintered ceramics. The densities of sintered PCN ceramics increased with increasing sintering temperature. However, it was observed that at too high temperature the density began to decrease. Change of dielectric properties with sintering temperature also followed the same trend as the density. Based on X-ray diffraction analysis, density data, SEM micrograph, and dielectric properties, the optimum sintering temperature for a high purity PCN ceramic was found to be about 1100 and 1150 °C. A strongly diffused dielectric peak also showed a typical characteristic of ferroelectric relaxors. The P-E hysteresis loops observed at -70 °C were of slim-loop type with small remnant polarization values, which confirmed relaxor ferroelectric behavior of PCN ceramics. © 2007 Elsevier B.V. All rights reserved.
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    Synthesis and dielectric and ferroelectric properties of ceramics in (1 - X)Pb(Zr1/2Ti1/2)O3-(x)Pb(Co 1/3Nb2/3)O3 system
    (2008-02-15)
    Prasatkhetragarn, Anurak
    ;
    Vittayakorn, Naratip
    ;
    Ananta, Supon
    ;
    Yimnirun, Rattikorn
    ;
    Cann, David P.
    Ceramics in a PZT-PCN system with the formula (1 - x)Pb(Zr <inf>1/2</inf>Ti<inf>1/2</inf>)O<inf>3</inf>-(x)Pb(Co<inf>1/3</inf>Nb <inf>2/3</inf>)O<inf>3</inf>, where x = 0.1-0.5, were prepared using a solid-state mixed-oxide technique (the columbite-wolframite precursor method). The phase formation behavior and microstructure were studied using X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. The dielectric and ferroelectric properties of the compounds were studied and discussed. Phase-pure perovskites of PZT-PCN ceramics were obtained over a wide compositional range. In addition, the XRD, dielectric, and ferroelectric properties confirmed that the morphotropic phase boundary (MPB) composition between the tetragonal and pseudo cubic phases of this system lied between 0.2 ≤ × ≤ 0.3. © 2008 The Japan Society of Applied Physics.
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