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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27665

    Title: Microwave dielectric properties of Ba2Ti9O20 materials prepared by reaction sintering process
    Authors: 張吉本;Chang, Chi-ben;Leou, Keh-chyang;Shu, Wen-yang;林諭男;Lin, I-nan
    Contributors: 淡江大學物理學系
    Keywords: Milling;Dielectric properties;BaTiO3 and titanates;Microwave materials
    Date: 2006
    Issue Date: 2009-12-31 10:35:41 (UTC+8)
    Publisher: Elsevier
    Abstract: We synthesized the Ba2Ti9O20 materials by direct reacting the nano-sized BaTiO3 with TiO2 powders. Pure Holland-like structure was obtained when the mixture of the nano-powders were calcined at 1100 °C. The influence of the processing method on the characteristics of the Ba2Ti9O20 powders and the related microwave dielectric properties for the sintered Ba2Ti9O20 materials was investigated. The combined high-energy-milling and ball-milling (HeM/BM) process results in pronounced improvement for the sinterability of the Ba2Ti9O20 powders such that the samples attain a density higher than 96.2% T.D. when sintered at 1200 °C/4 h. Such a sintering temperature is significantly lower than the one needed for densifying the BM-processed samples to the same high density (1350 °C/4 h). However, the HeM/BM-processed samples show pronouncedly inferior microwave quality factor (Q × f-value) to the BM-processed ones. Raman spectroscopic and SEM microstructural analyses imply that the prime factor resulting in lower Q × f-value for HeM/BM-processed samples is the incomplete development of the granular structure.
    Relation: Journal of the European Ceramic Society 26(10-11), pp.2087-2091
    DOI: 10.1016/j.jeurceramsoc.2005.09.101
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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