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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27517

    Title: Transmission electron microscopic microstructure of base-metal-electroded BaTiO3 capacitor materials with duplex structures
    Authors: Chen, Cheng-sao;Chou, Chen-chia;Yang, Wei-chun;Hu, Chen-ti;林諭男;Lin, I-nan
    Contributors: 淡江大學物理學系
    Date: 2004-01-15
    Issue Date: 2009-12-31 10:14:08 (UTC+8)
    Publisher: Japan Society of Applied Physics
    Abstract: Microstructures of core-shell or duplex-structured BaTiO3 materials were examined in detail by transmission electron microscopy (TEM) to correlate the microstructures of these materials with their dielectric properties. In core-shell structured materials, the grains, which contain a paraelectric shell surrounding the ferroelectric core, are frequently observed. The thickness of the shell decreased as the grains grew larger, whenever the samples were over-fired or were incorporated with SiO2 sintering aids. The variation of the core-shell microstructure of the samples with the thermal history of the materials clearly explains the extreme sensitivity of the dielectric constant-temperature (K-T) properties for these materials to processing parameters. In contrast, for duplex-structured materials, the heavily doped constituents of the samples remained as fine grains with paraelectric phase, whereas the lightly doped constituents of the materials grew, resulting in a core-shell microstructure via the incorporation of the MgO species. The K-T behavior of the duplex-structured materials is less process dependent than that of the core-shell structured ones.
    Relation: Japanese journal of applied physics 43 pt.1(1), pp.226-231
    DOI: 10.1143/JJAP.43.226
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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