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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/27548

    Title: Correlation of microwave dielectric properties and normal vibration modes of xBa„Mg1Õ3Ta2Õ3…O3– „1Àx…Ba„Mg1Õ3Nb2Õ3…O3 ceramics: I. Raman spectroscopy
    Authors: Chia, Chih-Ta;Chen, Yi-Chun;Cheng, Hsiu-Fung;林諭男;Lin, I-Nan
    Contributors: 淡江大學物理學系
    Date: 2003-09-01
    Issue Date: 2009-12-31 10:20:42 (UTC+8)
    Publisher: College Park: American Institute of Physics (AIP)
    Abstract: Micro-Raman measurements of xBa~Mg1/3Ta2/3)O3–(12x)Ba~Mg1/3Nb2/3)O3 perovskite ceramics, with x50, 0.25, 0.50, 0.75, and 1.0, were taken at room temperature. Raman results clearly show the 1:2 ordered structures of these compounds. Four A1g and five Eg Raman modes were unambiguously assigned. The A1g(O) phonon of the oxygen-octahedron stretch mode, which possesses the largest energy and width of all the observed Raman phonons, significantly influences the microwave dielectric properties of the materials. A higher vibration frequency of A1g(O) mode results in a lower dielectric constant, and a wider width of the mode corresponds to a lower Q3f value.
    Relation: Journal of Applied Physics 94(5), pp.3360-3364
    DOI: 10.1063/1.1597968
    Appears in Collections:[物理學系暨研究所] 期刊論文

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