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Author: search.filters.author.Vittayakorn, Wanwilai C.Subject: search.filters.subject.Dielectric property

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    Item type:Publication,
    Processing and characterizations of Bi2O3/BaTiO3 ceramic
    (2013-10-29)
    Vittayakorn, Wanwilai C.
    ;
    Banjong, Dondanai
    ;
    Vittayakorn, Naratip
    The objective of this work is to provide the process for making BaTiO<inf>3</inf>-based ceramics by adding bismuth oxide (Bi<inf>2</inf>O<inf>3</inf>) into the system. The attention is also focused on synthesis conditions, where sintering temperature exhibits a pronounced effect on phase formation, density, microstructure and dielectric properties of BaTiO3 ceramics doped with different contents of Bi<inf>2</inf>O<inf>3</inf> nanoparticles. The phases of BaTiO<inf>3</inf>-based ceramics have been prepared by solid state reaction using different Bi<inf>2</inf>O<inf>3</inf> amount and characterized by X-ray diffractometry, Archimedes's method, scanning electron microscopy and dielectric spectroscopy. The results show that single phase of BaTiO<inf>3</inf> with no evidence of secondary phase forms in all samples. Abnormal grain growth was found in pure BaTiO<inf>3</inf> ceramic with 37.30 μm of average grain size. After added Bi<inf>2</inf>O<inf>3</inf> nanoparticles into system, the grain size significantly decreases and the sintering temperature of BaTiO3-based ceramics efficiently reduces without degrading the dielectric characteristics. © (2013) Trans Tech Publications, Switzerland.
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    The influence of BMN addition on the phase formation, microstructure and dielectric property of BaTiO3 ceramic
    (2013-01-01)
    Vittayakorn, Wanwilai C.
    ;
    Pulphol, Nattakarn
    ;
    Roongtao, Rachanusorn
    ;
    Muanghlua, Rangson
    ;
    Vittayakorn, Naratip
    Solid solutions of the (1-x)BT-xBMN system were prepared successfully by the solid state reaction method followed by normal sintering in air. The phase formation, microstructure and dielectric property of BT-BMN ceramics were investigated as a function of compositions. XRD results showed a single perovskite phase for all compositions. Cubic-tetragonal transformation was found after adding BMN into the system. SEM micrographs revealed two very different grain sizes in the ceramics, with compositions of x = 0.02, 0.03, 0.04 and 0.05. Fine grains indicated a cubic structure, whereas large ones indicated a tetragonal structure. Regarding the dielectric property, Curie temperature decreased with increasing BMN content, whereas the er value increased until the BMN content reached 3 mol% before dropping to a lower value. Copyright © 2013 Taylor & Francis Group, LLC.